There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

Which is the smallest number that you can write using all the vowels exactly once?

Who can jump higher than a Mountain?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?