Critical Thinking Puzzles

X and Y are two different integers, greater than 1, with sum less than or equal to 100. S and P are two mathematicians; S knows the sum X+Y...

Albert and Bernard just met Cheryl. “When’s your birthday?” Albert asked Cheryl. Cheryl thought a second and said, “I’m not going to te...

What is the next number in this sequence: 5, 15, 1115, 3115, 132115, 1113122115, 311311222115, ?

Which of the following statements are true and which are false? 1. Only one of the statements is false. 2. Exactly two of the statements ...

A farmer and his neighbor once went to Emperor Akbar’s court with a complaint. “Your Majesty, I bought a well from him,” said the farmer ...

One day three Greek philosophers settled under the shade of an olive tree, opened a bottle of Retsina, and began a lengthy discussion of th...

How many 0’s are present in numbers from 1 to 200 ? (including both numbers)