Speak Both Languages
In a certain classroom, 75% of the students can speak English, 55% of the students can speak French, and 10% speak neither language. What percentage of the students speak both languages?
Area of the Rectangle
The shaded rectangle is tangent to the circle at the two points indicated, and its bottom right corner lies on the circumference of that circle. What is the area of the rectangle?
Favorite Fruit and Favorite Color
Ava, Beth, Cam, and Derek each have a different favorite fruit and favorite color. We know their favorite fruits are apple, banana, cherry, and durian, and their favorite colors are blue, green, red, and yellow. We also know: What is…
The Monty Hall Problem Explained
The Monty Hall Problem You are on a game show in which there are three identical doors, one with a car behind it and two with goats behind them. You must pick one door, and you win if that door…
7 Matchstick Equation Puzzles
In matchstick puzzles, you are presented with an incorrect equation made using matchsticks, and you must move 1 or more matchsticks to turn it into a valid equation. You must use all of the matches, and you are not allowed…
Color of the Last Ball
There is a bag with 20 blue balls and 13 red balls. Randomly remove 2 balls from the bag: Repeat this process until there is just 1 ball remaining. What is the color of the last ball?
10 Clever Riddles with Answers
Do some creative thinking and try to solve these 10 clever riddles: Riddle #1 What do you usually have to break before you can use it? Riddle #2 What do you need to answer even though it never asks a…
Matchstick Equation 4
Move exactly 2 matches to make this a valid equation. Bonus: find more than one solution. In matchstick equation puzzles, you are not allowed to make an inequality symbol such as ≠, ≥, >, <, or ≤. That would make…
8 Easy Rebus Puzzles for Kids
A rebus is a puzzle in which words, objects, or symbols are arranged in a way to indirectly represent a commonly known word or phrase. Solving rebus puzzles can be a fun and easy way for kids to think both…
Mate in 2 Chess Puzzle 3
White to play and mate in 2.
Maximize Triangle Area
If a triangle has two sides with lengths 3 and 4, what should the length of the third side be in order to maximize the area of the triangle?
Compound Word Puzzle 3
Compound words are words that are composed of two or more other words, like high + light = highlight. Can you make compound words out of the following three words by adding the same 4-letter word either before or after each word?
Multiple of 24
Prove that for all prime numbers p > 3, (p2 – 1) is a multiple of 24.
Most Frequent Digit
What is the most frequent digit among the numbers between 1 and 1000 (inclusive)? Consider only base-10 whole numbers.
Same Birthday in Line
There is a long line of people waiting to see a new movie. They announce that the first person to have the same birthday as someone standing before them in the line gets to meet one of the actors in…
Prison Keys Strategy
A prison warden was feeling capricious and played a game with the prison keys: What is the fewest number of days it would take for the prisoners to be sure everyone has their key? What was the strategy to achieve…
Digital Sum of the Sum
The digital sum of a number is just the sum of the individual digits. E.g., the digital sum of 123 is 1 + 2 + 3 = 6. What is the digital sum of z = x + y?
If you share me you haven’t got me
If you have me, you want to share me. If you share me, you haven’t got me. What am I?
Sharing Game Theory Puzzle
In this sharing game theory puzzle, 3 friends take turns taking from a jar of 1000 candies to share. For example, the 1st friend could take 500 candies, then the 2nd friend could take 400, and the 3rd friend would…
I Am Normally Below You Riddle
I am a 5-letter word. I am normally below you. If you remove my 1st letter, I am normally above you. If you remove my 1st and 2nd letters, I am all around you.
Rebus Puzzle 18
What common word or phrase is this rebus referring to? || READ ||
Rock Paper Scissors Puzzle
A rock paper scissors puzzle: Anya played 10 games of rock paper scissors against Blake Each time there was a winner (no ties) Anya used rock 2 times, paper 2 times, and scissors 6 times, but you don’t know the…
But Never Moves
What can go through towns and cities, over hills and mountains, but never moves?
Zero-less Factors
What two numbers contain no zeroes and can be multiplied together to produce 100000?
How Many Friday the 13th in a Year
Some consider Friday the 13th (any Friday that falls on the 13th day of a month) unlucky. In a calendar year, how many Friday the 13th can occur? Find both the minimum and maximum.