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)

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

What always comes into a house through the keyhole?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

In the picture given below, can you find out which digit will take place of the question mark?

Why is Saturday stronger than Monday?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

What makes this number unique: 8,549,176,320?

What can you hold in your right hand, but never in your left hand?