Rectify the following equality 101 - 102 = 1 by moving just one digit.
In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?
What is red and smells like blue paint?
Can you solve this amazing hard number series problem? 7, 8, 10, 12, 16, 18 ?
In a concert, Christina is performing a dance show with her group. At 10:00, she and her crew were dancing in an absolutely straight line. At that time Christina was standing in 4th position from both the front and back end of the row. What was the size of her crew?
What numbers should go on the bottom line? 3 6 9 15 8 2 10 12 11 8 19 27 19 10 29 39 ? ? ? ?
Can you calculate the probability of getting a sum of six when a dice is thrown twice?
How many bricks does it take to complete a building that is 15 feet wide, 30 feet deep, and 12 feet tall made of brick?
Count the squares in the matchstick puzzle below?
How many times can you subtract the number 5 from 25?
What has 13 hearts but no other organs?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.
