Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

What is common among 11, 69, and 88?

Can you write down eight eights so that they add up to one thousand?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

When it is alive we sing, when it is dead we clap our hands. What is it?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?