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

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

Find the missing number in the sequence below:

John was piloting a plane behind a car but was never able to overtake it. Why?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

What country can make you shiver?

How can you make number one disappear by adding something to it?

By adding four matchsticks, can you divide the square shown in the picture into two equal parts?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.