You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Using Only Five 5's and any mathematical operator make sum as 37

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

This is a famous paradox which has caused a great deal of argument and disbelief from many who cannot accept the correct answer. Four balls are placed in a hat. One is white, one is blue and the other two are red. The bag is shaken and someone draws two balls from the hat. He looks at the two balls and announces that at least one of them is red. What are the chances that the other ball he has drawn out is also red?

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.

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

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

While house hunting in London, I came across a very good leasehold property Discussing the lease the landlady told me:

'The property was originally on a 99 years lease and two-thirds of the time passed is equal to four-fifths of the time to come. Now work it out for yourself and see how many years are to go!

Can you count the number of quadrilaterals in the picture below?