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# How is it possible?

There are eight ping pong balls. One is lighter than the others, which all weigh the same. How is it possible to tell which is the lightest ball by using a balance scale only twice?

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Place three balls on one side of the scale and three on the other. If the two sides balance, then the light ball is among the remaining two and a second weighing will tell which it is. If the first weighing shows a disparity, however, take the three balls weighing the least and place one on each side of the scale, putting one to the side. If the two balance, the third is the light one. If they dont balance, you know which one is light.

## How does the man escape?

A man is trapped in a room. The room has only two possible exits: two doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing...

## Five-digit number

What is the five-digit number, no zeroes, in which the second digit is three times the first, the third is one more than the second, the fourth is four times the first, and the last is one-half more than the second? The number is: 26789 more...