An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Which part of London exists in France as well ?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

How is a fly different from a mosquito?

What work can one never finish?

A man is trapped in a room. The room has only two possible exits 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 dragon. How does the man escape?