Olympiad Numbers and Arithmetic

Find the smallest positive integer that must be added to . . .Olympiad Numbers and Arithmetic

Which gives the smallest answer?Olympiad Numbers and Arithmetic

How many digits are in the product of 2^{101} and 5^{99}? Olympiad Numbers and Arithmetic

Choose the answer without using a calculator. Which . . .Olympiad Numbers and Arithmetic

On this target, I scored exactly 80. How many shots did . . .Olympiad Numbers and Arithmetic

Which gives the largest answer?Olympiad Numbers and Arithmetic

What is the largest sum of two integers so that their . . .Olympiad Numbers and Arithmetic

The date July 31, 1370 in MM/DD/YYYY format is a palindrome . . .Olympiad Numbers and Arithmetic

An hour ago, I notched up 78987 kilometers on my odometer. . . .Olympiad Numbers and Arithmetic

Make two fractions with all the digits from 0 to 9. Use . . .Olympiad Numbers and Arithmetic

Make 33 by using three 3s and any math operators. How . . .Olympiad Numbers and Arithmetic

Pairs of primes separated by a single number are called . . .Olympiad Algebra

Find the sum of all the elements of this finite geometric . . .Olympiad Algebra

The last digit of the number 3^{33} is:Olympiad Algebra

A perfect cube is an integer whose cube root is an integer. . . .Olympiad Algebra

Eugenia used 192 digits to number the pages in her diary. . . .Olympiad Algebra

How many digits are in the result of the expression? . . .Olympiad Algebra

How many 2-digit numbers have a tens digit that is smaller . . .Olympiad Algebra

Which of the following gives the biggest answer?Olympiad Algebra

Choose the answer without using a calculator. I multiply . . .Olympiad Algebra

A square game board begins with a dark square alternating . . .Olympiad Algebra

How many "yes or no" questions are needed to guess any . . .Olympiad Geometry

How many of the letters in the Russian alphabet have more . . .Olympiad Geometry

For which letter did I use the smallest amount of green . . .Olympiad Geometry

Each square is 1 square unit. What is the area of the . . .Olympiad Geometry

The figure shows a regular hexagon. What is the . . .Olympiad Geometry

I strike a pool ball from corner A of the rectangular . . .Olympiad Geometry

The squares have side lengths of 2 and 4. Find the area . . .Olympiad Geometry

The figure shows a regular octagon. What is the area of . . .Olympiad Geometry

The diagram illustrates a row of three squares formed by . . .Olympiad Geometry

Two lines and two diagonals are drawn through the center of . . .Olympiad Geometry

How many equilateral triangles can you create using six . . .Olympiad Geometry

A boy cuts a cardboard circle and only cuts 5 straight . . .Olympiad Geometry

How many planes of symmetry does a cube have?Olympiad Geometry

A six-pointed regular star consists of two areas. What is . . .Olympiad Geometry

The figure shows a red equilateral triangle inscribed . . .Olympiad Geometry

There are 2 identical circles. Circle A remains fixed . . .Olympiad Geometry

How many squares can you make using twelve identical . . .Olympiad Geometry

Twenty matchsticks form five squares (one 3x3 and four . . .Olympiad Geometry

Which of the nets can be folded into a box with a red . . .Olympiad Geometry

A ladder leans against a vertical wall. The top of the . . .Olympiad Geometry

All inner lines connect the corners of the big square and . . .Olympiad Geometry

The sizes of the sealed bottle with water are shown in the . . .Olympiad Geometry

How many equilateral triangles can you make using six . . .Olympiad Geometry

In a 3 x 3 grid, there are 8 lines that contain at least 3 . . .Olympiad Geometry

How many triangles are there?Olympiad Geometry

The following pattern is cut and folded to a square-based . . .Olympiad Geometry

I fold a square piece of paper in half four times without . . .Olympiad Geometry

Every face of a cube has at least one white edge. What . . .Olympiad Geometry

How many squares can be formed by joining four of these . . .Olympiad Geometry

How many more lines can I draw to make a shape that has a . . .Olympiad Geometry

I want to place together five identical shapes without . . .Olympiad Geometry

Compare areas F and G Olympiad Geometry

The left picture shows nine dots arranged in a 3 x 3 . . .Olympiad Geometry

What is the sum of the marked angles?Olympiad Geometry

The picture shows six equilateral triangles. The sides of . . .Olympiad Geometry

The shaded rhombus is formed by joining vertices of the . . .Olympiad Geometry

Which of these diagrams could be drawn without taking the . . .Olympiad Geometry

The diagram shows 15 billiard balls that fit exactly inside . . .Olympiad Geometry

What is the smallest number of segments that needs to be . . .Olympiad Geometry

The picture shows the areas of three rectangles. What is . . .Olympiad Geometry

This shape was formed by removing a small cube from a big . . .Olympiad Geometry

I want to cut round bread into eight equal pieces. . . .Olympiad Geometry

A girl wants to cut the paper into several equal pieces of . . .Olympiad Geometry

How many colored four-unit shapes can be placed inside the . . .Olympiad Geometry

Two triangles form seven separate regions. What is the . . .Olympiad Geometry

What fraction of the large equilateral triangle is colored?Olympiad Geometry

Four matchsticks form a square. How many non-overlapping . . .Olympiad Geometry

There are six ways to travel from point S to point F on a . . .Olympiad Geometry

The game Battleship (Battleships or Sea Battle) is a . . .Olympiad Geometry

Seven squares with side length of 1, 2, 2, 2, 3, 4, and 5 . . .Olympiad Geometry

I want to cut this shape into four pieces all of precisely . . .Olympiad Geometry

How many circles are needed to separate each star from all . . .Olympiad Geometry

I would like to cut the shape into the fewest possible . . .Olympiad Geometry

A, B, and C are squares with sides of length 1; D, E, and . . .Olympiad Geometry

I arrange 10 points so that 3 lines each go through 4 . . .Olympiad Geometry

Find the radius of the circle.Olympiad Geometry

In a city, there were seven bridges. There was a . . .Olympiad Geometry

Four matchsticks form a square. How many non-overlapping . . .Olympiad Geometry

A sphere fits inside a cube. The maximum possible ratio of . . .Olympiad Geometry

I want to cut a wooden cube that is five inches on each . . .Olympiad Geometry

I arranged twelve one-inch wooden sticks in a polygon with . . .Olympiad Geometry

Find the angle between two diagonals drawn on two faces of . . .Olympiad Geometry

What line divides the green polygon into two parts of equal . . .Olympiad Geometry

I need 1 + 4 + 9 + 16 + 25 = 55 cubes to build a pyramid . . .Olympiad Geometry

A bug walks from corner A of a room to corner B by only . . .Olympiad Geometry

What is the volume of the second glass compared to the . . .Olympiad Geometry

I take a map of the city where I live and lay it on my . . .Olympiad Geometry

I connected the midpoints of a polygon and constructed a . . .Olympiad Geometry

A pyramid and a tetrahedron with edges of the same length . . .Olympiad Geometry

Cut the shape into two pieces and create a square from . . .Olympiad Geometry

I need 1 + 9 + 25 = 35 cubes to build a pyramid with a . . .Olympiad Geometry

Find the missing part.Olympiad Geometry

If a square is four and a triangle is three, how many is a . . .Olympiad Geometry

Inspired by Boris Kordemsky. Four Knights problem: Cut . . .Olympiad Geometry

A square with a side length 20 has two vertices on the . . .Olympiad Geometry

What is the difference between the red area and the blue . . .Olympiad Geometry

How many 1x1 squares fit into the large square with the . . .Olympiad Geometry

The picture shows three squares with the side lengths of . . .Olympiad Data Analysis

How many stars will be in the fourth line of the pattern? Olympiad Data Analysis

Three boxes contain two coins each. One contains two . . .Olympiad Data Analysis

Four kinds of apples are combined in a box. I select . . .Olympiad Data Analysis

By drawing two marks on a wooden ruler, we can measure 1, . . .Olympiad Data Analysis

Four cowboys have a meeting in a saloon. Each cowboy has . . .Olympiad Data Analysis

Which shape cannot be folded to form an open box?Olympiad Data Analysis

How many seconds were in 2012?Olympiad Data Analysis

Forty non-zero positive numbers are written in a row. The . . .Olympiad Data Analysis

Make 727 by using three 7s. You can use any math operator . . .Olympiad Data Analysis

Place the number tiles in the squares so that no two . . .Olympiad Data Analysis

Anna (A), Bill (B), Cindy (C), and Daniel (D) work on a . . .Olympiad Data Analysis

How many different cubes can I make by using six different . . .Olympiad Data Analysis

Logic puzzle: Counting down from 100 by one, which . . .Olympiad Data Analysis

What is the logic behind? What is correct answer?Olympiad Data Analysis

What is heavier than a cumulus cloud, which is about 1 . . .Olympiad Data Analysis

Eight bugs are at the eight corners of an equilateral cube. . . .Olympiad Data Analysis

Logic question. What is the easiest way to makethe . . .Olympiad Data Analysis

How many coins must you move to form two lines, each with . . .Olympiad Data Analysis

Order the shape by weight from lightest to heaviest.Olympiad Data Analysis

Order the shape by weight from lightest to heaviest.Olympiad Data Analysis

A chess queen attacks all squares along its path . . .Olympiad Data Analysis

We want to merge 4 companies into one large company. How . . .Olympiad Data Analysis

A bus carrying 5 tourists travels to Dogland. Every tourist . . .Olympiad Data Analysis

Alex and Bill both have some money. Alex is short of two . . .Olympiad Data Analysis

Place the cards into two boxes so that the probability of . . .Olympiad Data Analysis

Arrange nine numbers in a circle so that the difference . . .Olympiad Data Analysis

You can throw as many darts at the board below. Some . . .Olympiad Logic

Each of four children has a photo. Anna and Bill's photos . . .Olympiad Logic

There are 20 students in a class. 12 students have red . . .Olympiad Logic

Tom writes a total of forty words on five blank cards. He . . .Olympiad Logic

Brad has as many brothers as sisters. How many more . . .Olympiad Logic

The total weight of Bob and his sister Anna is 155 . . .Olympiad Logic

Ten men met at a conference. Each man shook hands with . . .Olympiad Logic

The product of three consecutive whole numbers is 999900. . . .Olympiad Logic

Three referees, A, B, and C, are at the corners of a . . .Olympiad Logic

How many cubes will balance one sphere?Olympiad Logic

Alex needs six tacks to fix two rectangular pictures . . .Olympiad Logic

There is a set of 10 numbers. Five numbers are selected . . .Olympiad Logic

I want to fill a 4-litre bucket with milk using a 5-litre . . .Olympiad Logic

In the first week John made $1. He made 5 times more than . . .Olympiad Logic

Anna's income is seven-eighths that of Beatrice. Anna's . . .Olympiad Logic

The first six numbers in a sequence are shown on the right. . . .Olympiad Logic

The number 99! is very big. How many zeros are there at . . .Olympiad Logic

What is the sum of 99 consecutive integers, if a third of . . .Olympiad Logic

I arrange five marbles randomly in a ring. There are two . . .Olympiad Logic

The twins are of the same height. They place four . . .Olympiad Logic

Ten years ago, Bob was three times as old as Anna. Today, . . .Olympiad Logic

How many straight lines are needed to separate each star . . .Olympiad Logic

Two gears, one with 11 teeth and the other one with 18 . . .Olympiad Logic

You take half of syrup and mix it with the water, and then . . .Olympiad Logic

The matchsticks make a spiral that goes clockwise. How . . .Olympiad Logic

The figure shows a triangle made of discs. I want to move . . .Olympiad Logic

Two rectangles enclose five regions. Find 2 figures that . . .Olympiad Logic

In-Out Machine transforms 111121 into 100. The same . . .Olympiad Logic

An analogue clock loses 15 minutes each hour. If the . . .Olympiad Logic

The product of 2 integers is 1000. Find the smallest . . .Olympiad Logic

What is the condition for the smallest ten-digit integer . . .Olympiad Logic

A lady, attempting to avoid revealing her real age to her . . .Olympiad Logic

The addition shown here has 21 terms and the last element . . .Olympiad Logic

There is a total of 6 squares whose vertices are points on . . .Olympiad Logic

I put $990 into 10 envelopes. I try to compose all . . .Olympiad Logic

Alex has bills of different dollar values. There are five . . .Olympiad Logic

There are four brothers in a family. The sums of the ages . . .Olympiad Logic

In how many ways can the name ALEX be spelt out, using . . .Olympiad Logic

What number should replace the question mark?Olympiad Logic

What number should replace the question mark?Olympiad Logic

Find the missing figure.Olympiad Logic

Which shape fits in the missing space to complete the . . .Olympiad Logic

Three children and two adults want to cross a river. . . .Olympiad Logic

I wrote all the numbers from 0 to 999. Which digit did I . . .Olympiad Logic

How many different ways are there to go from A to B?Olympiad Logic

Each of these seven cells contains one number from 1 to 7, . . .Olympiad Logic

Two apples and two peppers have the same weight as three . . .Olympiad Logic

There are eight buckets; four of them are filled with . . .Olympiad Logic

I enclosed 9 apple trees using a large square fence. . . .Olympiad Logic

A group of gentlemen visited a produce shop. Each . . .Olympiad Logic

A number is said to be perfect if it is equal to the sum of . . .Olympiad Logic

The matchsticks make four small squares and one big square. . . .Olympiad Logic

A banker forgets which key fits in which of three keyholes. . . .Olympiad Logic

You have four piles: three piles with real coins and one . . .Olympiad Logic

Anna ran in the north direction at a speed of 8 km/h, Bobby . . .Olympiad Logic

I must balance any whole number load from 1 kg to 40 kg . . .Olympiad Logic

How many different lines can you draw through any two of . . .Olympiad Logic

A kitten has a 50/50 chance to be male or female. My cat . . .Olympiad Logic

If each row and each column of the square must contain . . .Olympiad Logic

Find the next letter in the sequence.Olympiad Logic

A bee crawls along the sides of the honeycomb hexagons. . . .Olympiad Logic

I would like to plant 10 trees in 5 rows of X trees. . . .Olympiad Logic

A farmer puts several pigs into three pens. None of the . . .Olympiad Logic

Thinking outside the box: 52 - 28 = 4 Which digit . . .Olympiad Logic

Large individual letters are differently priced. The . . .Olympiad Logic

I want to measure exactly six minutes from the moment I . . .Olympiad Logic

Bill (B), Cindy (C), and Daniel (D) work on a project. . . .Olympiad Logic

Logic riddle In a house, there are three switches on the . . .Olympiad Logic

A lot of money is in a box. None or just one inscription . . .Olympiad Logic

One hundred soldiers form a 10 x 10 square. From every . . .Olympiad Logic

What is the next letter in this series?Olympiad Logic

What is the smallest number of matchsticks you remove to . . .Olympiad Logic

A donkey must transport 900 carrots to the market, which is . . .Olympiad Logic

The figure shows a triangle made of discs. I want to move . . .Olympiad Logic

Logic riddle: In a house, there are three switches on the . . .Olympiad Logic

Five pieces of chain must be jointed into a long chain. . . .Olympiad Logic

Which direction is the London school minibus going?Olympiad Logic

Divide the circles into two groups so that the sums of the . . .Olympiad Logic

You work for seven days and receive a medal at the end of . . .Olympiad Logic

Which figure completes the sequence?Olympiad Logic

"Three sailors come across a pile of coconuts. The first . . .Olympiad Logic

**United we stand, divided we fall.** How many sets of . . .Olympiad Logic

Mount Everest is the Earth's highest mountain with a peak . . .Olympiad Logic

An Honesty shop sells the first candy for 1 Swiss franc and . . .Olympiad Logic

The numbers are the total of the values of the symbols . . .Olympiad Logic

Thinking outside the box. Solve this:Olympiad Logic

Which symbol goes next?Olympiad Applied Math

The number of hours left today is half of the number of . . .Olympiad Applied Math

The total price of an apple and a tangerine is 39 cents. . . .Olympiad Applied Math

The left clock runs slower at a rate of 6 minutes per hour. . . .Olympiad Applied Math

If three students eat three apples in 33 seconds, how long . . .Olympiad Applied Math

A father wishes to divide a square piece of land among his . . .Olympiad Applied Math

A city hall floor is to be tiled in the following pattern. . . .Olympiad Applied Math

It costs $24 to paint a cube. Before painting, it was cut . . .Olympiad Applied Math

The traveling salesman problem: a salesman has to visit 9 . . .Olympiad Applied Math

How many boxes measuring 1 x 2 x 3 can be packed into a . . .Olympiad Applied Math

The diagram illustrates five villages, A, B, C, D, and E, . . .Olympiad Applied Math

Enclosed is a lamb using a 4-crosspiece log fence. What . . .Olympiad Applied Math

How many different nonzero weights can you measure with a . . .Olympiad Applied Math

Three boys want to equally share three pancakes. The . . .Olympiad Applied Math

A jigsaw puzzle consists of 250 identical pieces to spread . . .Olympiad Applied Math

Find the best deal.Olympiad Applied Math

You have 240 golden bricks identical in size and appearance . . .Olympiad Applied Math

I have a rectangular piece of cheese with a round hole. . . .Olympiad Applied Math

I place 1000 coins in two columns of a wooden box. How . . .Olympiad Applied Math

The Lucas problem. François Édouard Anatole Lucas . . .Olympiad Applied Math

The red-line subway train arrives at a station every 5 . . .Olympiad Applied Math

How many 1x1 squares fit into the large square with the . . .Olympiad Applied Math

What is the minimum number of cuts needed to cut a log . . .

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Find the smallest positive integer that must be added to . . .Olympiad Numbers and Arithmetic

Which gives the smallest answer?Olympiad Numbers and Arithmetic

How many digits are in the product of 2

Choose the answer without using a calculator. Which . . .Olympiad Numbers and Arithmetic

On this target, I scored exactly 80. How many shots did . . .Olympiad Numbers and Arithmetic

Which gives the largest answer?Olympiad Numbers and Arithmetic

What is the largest sum of two integers so that their . . .Olympiad Numbers and Arithmetic

The date July 31, 1370 in MM/DD/YYYY format is a palindrome . . .Olympiad Numbers and Arithmetic

An hour ago, I notched up 78987 kilometers on my odometer. . . .Olympiad Numbers and Arithmetic

Make two fractions with all the digits from 0 to 9. Use . . .Olympiad Numbers and Arithmetic

Make 33 by using three 3s and any math operators. How . . .Olympiad Numbers and Arithmetic

Pairs of primes separated by a single number are called . . .Olympiad Algebra

Find the sum of all the elements of this finite geometric . . .Olympiad Algebra

The last digit of the number 3

A perfect cube is an integer whose cube root is an integer. . . .Olympiad Algebra

Eugenia used 192 digits to number the pages in her diary. . . .Olympiad Algebra

How many digits are in the result of the expression? . . .Olympiad Algebra

How many 2-digit numbers have a tens digit that is smaller . . .Olympiad Algebra

Which of the following gives the biggest answer?Olympiad Algebra

Choose the answer without using a calculator. I multiply . . .Olympiad Algebra

A square game board begins with a dark square alternating . . .Olympiad Algebra

How many "yes or no" questions are needed to guess any . . .Olympiad Geometry

How many of the letters in the Russian alphabet have more . . .Olympiad Geometry

For which letter did I use the smallest amount of green . . .Olympiad Geometry

Each square is 1 square unit. What is the area of the . . .Olympiad Geometry

The figure shows a regular hexagon. What is the . . .Olympiad Geometry

I strike a pool ball from corner A of the rectangular . . .Olympiad Geometry

The squares have side lengths of 2 and 4. Find the area . . .Olympiad Geometry

The figure shows a regular octagon. What is the area of . . .Olympiad Geometry

The diagram illustrates a row of three squares formed by . . .Olympiad Geometry

Two lines and two diagonals are drawn through the center of . . .Olympiad Geometry

How many equilateral triangles can you create using six . . .Olympiad Geometry

A boy cuts a cardboard circle and only cuts 5 straight . . .Olympiad Geometry

How many planes of symmetry does a cube have?Olympiad Geometry

A six-pointed regular star consists of two areas. What is . . .Olympiad Geometry

The figure shows a red equilateral triangle inscribed . . .Olympiad Geometry

There are 2 identical circles. Circle A remains fixed . . .Olympiad Geometry

How many squares can you make using twelve identical . . .Olympiad Geometry

Twenty matchsticks form five squares (one 3x3 and four . . .Olympiad Geometry

Which of the nets can be folded into a box with a red . . .Olympiad Geometry

A ladder leans against a vertical wall. The top of the . . .Olympiad Geometry

All inner lines connect the corners of the big square and . . .Olympiad Geometry

The sizes of the sealed bottle with water are shown in the . . .Olympiad Geometry

How many equilateral triangles can you make using six . . .Olympiad Geometry

In a 3 x 3 grid, there are 8 lines that contain at least 3 . . .Olympiad Geometry

How many triangles are there?Olympiad Geometry

The following pattern is cut and folded to a square-based . . .Olympiad Geometry

I fold a square piece of paper in half four times without . . .Olympiad Geometry

Every face of a cube has at least one white edge. What . . .Olympiad Geometry

How many squares can be formed by joining four of these . . .Olympiad Geometry

How many more lines can I draw to make a shape that has a . . .Olympiad Geometry

I want to place together five identical shapes without . . .Olympiad Geometry

Compare areas F and G Olympiad Geometry

The left picture shows nine dots arranged in a 3 x 3 . . .Olympiad Geometry

What is the sum of the marked angles?Olympiad Geometry

The picture shows six equilateral triangles. The sides of . . .Olympiad Geometry

The shaded rhombus is formed by joining vertices of the . . .Olympiad Geometry

Which of these diagrams could be drawn without taking the . . .Olympiad Geometry

The diagram shows 15 billiard balls that fit exactly inside . . .Olympiad Geometry

What is the smallest number of segments that needs to be . . .Olympiad Geometry

The picture shows the areas of three rectangles. What is . . .Olympiad Geometry

This shape was formed by removing a small cube from a big . . .Olympiad Geometry

I want to cut round bread into eight equal pieces. . . .Olympiad Geometry

A girl wants to cut the paper into several equal pieces of . . .Olympiad Geometry

How many colored four-unit shapes can be placed inside the . . .Olympiad Geometry

Two triangles form seven separate regions. What is the . . .Olympiad Geometry

What fraction of the large equilateral triangle is colored?Olympiad Geometry

Four matchsticks form a square. How many non-overlapping . . .Olympiad Geometry

There are six ways to travel from point S to point F on a . . .Olympiad Geometry

The game Battleship (Battleships or Sea Battle) is a . . .Olympiad Geometry

Seven squares with side length of 1, 2, 2, 2, 3, 4, and 5 . . .Olympiad Geometry

I want to cut this shape into four pieces all of precisely . . .Olympiad Geometry

How many circles are needed to separate each star from all . . .Olympiad Geometry

I would like to cut the shape into the fewest possible . . .Olympiad Geometry

A, B, and C are squares with sides of length 1; D, E, and . . .Olympiad Geometry

I arrange 10 points so that 3 lines each go through 4 . . .Olympiad Geometry

Find the radius of the circle.Olympiad Geometry

In a city, there were seven bridges. There was a . . .Olympiad Geometry

Four matchsticks form a square. How many non-overlapping . . .Olympiad Geometry

A sphere fits inside a cube. The maximum possible ratio of . . .Olympiad Geometry

I want to cut a wooden cube that is five inches on each . . .Olympiad Geometry

I arranged twelve one-inch wooden sticks in a polygon with . . .Olympiad Geometry

Find the angle between two diagonals drawn on two faces of . . .Olympiad Geometry

What line divides the green polygon into two parts of equal . . .Olympiad Geometry

I need 1 + 4 + 9 + 16 + 25 = 55 cubes to build a pyramid . . .Olympiad Geometry

A bug walks from corner A of a room to corner B by only . . .Olympiad Geometry

What is the volume of the second glass compared to the . . .Olympiad Geometry

I take a map of the city where I live and lay it on my . . .Olympiad Geometry

I connected the midpoints of a polygon and constructed a . . .Olympiad Geometry

A pyramid and a tetrahedron with edges of the same length . . .Olympiad Geometry

Cut the shape into two pieces and create a square from . . .Olympiad Geometry

I need 1 + 9 + 25 = 35 cubes to build a pyramid with a . . .Olympiad Geometry

Find the missing part.Olympiad Geometry

If a square is four and a triangle is three, how many is a . . .Olympiad Geometry

Inspired by Boris Kordemsky. Four Knights problem: Cut . . .Olympiad Geometry

A square with a side length 20 has two vertices on the . . .Olympiad Geometry

What is the difference between the red area and the blue . . .Olympiad Geometry

How many 1x1 squares fit into the large square with the . . .Olympiad Geometry

The picture shows three squares with the side lengths of . . .Olympiad Data Analysis

How many stars will be in the fourth line of the pattern? Olympiad Data Analysis

Three boxes contain two coins each. One contains two . . .Olympiad Data Analysis

Four kinds of apples are combined in a box. I select . . .Olympiad Data Analysis

By drawing two marks on a wooden ruler, we can measure 1, . . .Olympiad Data Analysis

Four cowboys have a meeting in a saloon. Each cowboy has . . .Olympiad Data Analysis

Which shape cannot be folded to form an open box?Olympiad Data Analysis

How many seconds were in 2012?Olympiad Data Analysis

Forty non-zero positive numbers are written in a row. The . . .Olympiad Data Analysis

Make 727 by using three 7s. You can use any math operator . . .Olympiad Data Analysis

Place the number tiles in the squares so that no two . . .Olympiad Data Analysis

Anna (A), Bill (B), Cindy (C), and Daniel (D) work on a . . .Olympiad Data Analysis

How many different cubes can I make by using six different . . .Olympiad Data Analysis

Logic puzzle: Counting down from 100 by one, which . . .Olympiad Data Analysis

What is the logic behind? What is correct answer?Olympiad Data Analysis

What is heavier than a cumulus cloud, which is about 1 . . .Olympiad Data Analysis

Eight bugs are at the eight corners of an equilateral cube. . . .Olympiad Data Analysis

Logic question. What is the easiest way to makethe . . .Olympiad Data Analysis

How many coins must you move to form two lines, each with . . .Olympiad Data Analysis

Order the shape by weight from lightest to heaviest.Olympiad Data Analysis

Order the shape by weight from lightest to heaviest.Olympiad Data Analysis

A chess queen attacks all squares along its path . . .Olympiad Data Analysis

We want to merge 4 companies into one large company. How . . .Olympiad Data Analysis

A bus carrying 5 tourists travels to Dogland. Every tourist . . .Olympiad Data Analysis

Alex and Bill both have some money. Alex is short of two . . .Olympiad Data Analysis

Place the cards into two boxes so that the probability of . . .Olympiad Data Analysis

Arrange nine numbers in a circle so that the difference . . .Olympiad Data Analysis

You can throw as many darts at the board below. Some . . .Olympiad Logic

Each of four children has a photo. Anna and Bill's photos . . .Olympiad Logic

There are 20 students in a class. 12 students have red . . .Olympiad Logic

Tom writes a total of forty words on five blank cards. He . . .Olympiad Logic

Brad has as many brothers as sisters. How many more . . .Olympiad Logic

The total weight of Bob and his sister Anna is 155 . . .Olympiad Logic

Ten men met at a conference. Each man shook hands with . . .Olympiad Logic

The product of three consecutive whole numbers is 999900. . . .Olympiad Logic

Three referees, A, B, and C, are at the corners of a . . .Olympiad Logic

How many cubes will balance one sphere?Olympiad Logic

Alex needs six tacks to fix two rectangular pictures . . .Olympiad Logic

There is a set of 10 numbers. Five numbers are selected . . .Olympiad Logic

I want to fill a 4-litre bucket with milk using a 5-litre . . .Olympiad Logic

In the first week John made $1. He made 5 times more than . . .Olympiad Logic

Anna's income is seven-eighths that of Beatrice. Anna's . . .Olympiad Logic

The first six numbers in a sequence are shown on the right. . . .Olympiad Logic

The number 99! is very big. How many zeros are there at . . .Olympiad Logic

What is the sum of 99 consecutive integers, if a third of . . .Olympiad Logic

I arrange five marbles randomly in a ring. There are two . . .Olympiad Logic

The twins are of the same height. They place four . . .Olympiad Logic

Ten years ago, Bob was three times as old as Anna. Today, . . .Olympiad Logic

How many straight lines are needed to separate each star . . .Olympiad Logic

Two gears, one with 11 teeth and the other one with 18 . . .Olympiad Logic

You take half of syrup and mix it with the water, and then . . .Olympiad Logic

The matchsticks make a spiral that goes clockwise. How . . .Olympiad Logic

The figure shows a triangle made of discs. I want to move . . .Olympiad Logic

Two rectangles enclose five regions. Find 2 figures that . . .Olympiad Logic

In-Out Machine transforms 111121 into 100. The same . . .Olympiad Logic

An analogue clock loses 15 minutes each hour. If the . . .Olympiad Logic

The product of 2 integers is 1000. Find the smallest . . .Olympiad Logic

What is the condition for the smallest ten-digit integer . . .Olympiad Logic

A lady, attempting to avoid revealing her real age to her . . .Olympiad Logic

The addition shown here has 21 terms and the last element . . .Olympiad Logic

There is a total of 6 squares whose vertices are points on . . .Olympiad Logic

I put $990 into 10 envelopes. I try to compose all . . .Olympiad Logic

Alex has bills of different dollar values. There are five . . .Olympiad Logic

There are four brothers in a family. The sums of the ages . . .Olympiad Logic

In how many ways can the name ALEX be spelt out, using . . .Olympiad Logic

What number should replace the question mark?Olympiad Logic

What number should replace the question mark?Olympiad Logic

Find the missing figure.Olympiad Logic

Which shape fits in the missing space to complete the . . .Olympiad Logic

Three children and two adults want to cross a river. . . .Olympiad Logic

I wrote all the numbers from 0 to 999. Which digit did I . . .Olympiad Logic

How many different ways are there to go from A to B?Olympiad Logic

Each of these seven cells contains one number from 1 to 7, . . .Olympiad Logic

Two apples and two peppers have the same weight as three . . .Olympiad Logic

There are eight buckets; four of them are filled with . . .Olympiad Logic

I enclosed 9 apple trees using a large square fence. . . .Olympiad Logic

A group of gentlemen visited a produce shop. Each . . .Olympiad Logic

A number is said to be perfect if it is equal to the sum of . . .Olympiad Logic

The matchsticks make four small squares and one big square. . . .Olympiad Logic

A banker forgets which key fits in which of three keyholes. . . .Olympiad Logic

You have four piles: three piles with real coins and one . . .Olympiad Logic

Anna ran in the north direction at a speed of 8 km/h, Bobby . . .Olympiad Logic

I must balance any whole number load from 1 kg to 40 kg . . .Olympiad Logic

How many different lines can you draw through any two of . . .Olympiad Logic

A kitten has a 50/50 chance to be male or female. My cat . . .Olympiad Logic

If each row and each column of the square must contain . . .Olympiad Logic

Find the next letter in the sequence.Olympiad Logic

A bee crawls along the sides of the honeycomb hexagons. . . .Olympiad Logic

I would like to plant 10 trees in 5 rows of X trees. . . .Olympiad Logic

A farmer puts several pigs into three pens. None of the . . .Olympiad Logic

Thinking outside the box: 52 - 28 = 4 Which digit . . .Olympiad Logic

Large individual letters are differently priced. The . . .Olympiad Logic

I want to measure exactly six minutes from the moment I . . .Olympiad Logic

Bill (B), Cindy (C), and Daniel (D) work on a project. . . .Olympiad Logic

Logic riddle In a house, there are three switches on the . . .Olympiad Logic

A lot of money is in a box. None or just one inscription . . .Olympiad Logic

One hundred soldiers form a 10 x 10 square. From every . . .Olympiad Logic

What is the next letter in this series?Olympiad Logic

What is the smallest number of matchsticks you remove to . . .Olympiad Logic

A donkey must transport 900 carrots to the market, which is . . .Olympiad Logic

The figure shows a triangle made of discs. I want to move . . .Olympiad Logic

Logic riddle: In a house, there are three switches on the . . .Olympiad Logic

Five pieces of chain must be jointed into a long chain. . . .Olympiad Logic

Which direction is the London school minibus going?Olympiad Logic

Divide the circles into two groups so that the sums of the . . .Olympiad Logic

You work for seven days and receive a medal at the end of . . .Olympiad Logic

Which figure completes the sequence?Olympiad Logic

"Three sailors come across a pile of coconuts. The first . . .Olympiad Logic

Mount Everest is the Earth's highest mountain with a peak . . .Olympiad Logic

An Honesty shop sells the first candy for 1 Swiss franc and . . .Olympiad Logic

The numbers are the total of the values of the symbols . . .Olympiad Logic

Thinking outside the box. Solve this:Olympiad Logic

Which symbol goes next?Olympiad Applied Math

The number of hours left today is half of the number of . . .Olympiad Applied Math

The total price of an apple and a tangerine is 39 cents. . . .Olympiad Applied Math

The left clock runs slower at a rate of 6 minutes per hour. . . .Olympiad Applied Math

If three students eat three apples in 33 seconds, how long . . .Olympiad Applied Math

A father wishes to divide a square piece of land among his . . .Olympiad Applied Math

A city hall floor is to be tiled in the following pattern. . . .Olympiad Applied Math

It costs $24 to paint a cube. Before painting, it was cut . . .Olympiad Applied Math

The traveling salesman problem: a salesman has to visit 9 . . .Olympiad Applied Math

How many boxes measuring 1 x 2 x 3 can be packed into a . . .Olympiad Applied Math

The diagram illustrates five villages, A, B, C, D, and E, . . .Olympiad Applied Math

Enclosed is a lamb using a 4-crosspiece log fence. What . . .Olympiad Applied Math

How many different nonzero weights can you measure with a . . .Olympiad Applied Math

Three boys want to equally share three pancakes. The . . .Olympiad Applied Math

A jigsaw puzzle consists of 250 identical pieces to spread . . .Olympiad Applied Math

Find the best deal.Olympiad Applied Math

You have 240 golden bricks identical in size and appearance . . .Olympiad Applied Math

I have a rectangular piece of cheese with a round hole. . . .Olympiad Applied Math

I place 1000 coins in two columns of a wooden box. How . . .Olympiad Applied Math

The Lucas problem. François Édouard Anatole Lucas . . .Olympiad Applied Math

The red-line subway train arrives at a station every 5 . . .Olympiad Applied Math

How many 1x1 squares fit into the large square with the . . .Olympiad Applied Math

What is the minimum number of cuts needed to cut a log . . .

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