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?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

In the Mexico City area, there are two Houses H1 and H2. Both H1 and H2 have two children each.
In House H1, The boy plays for Mexico Youth academy and the other child plays baseball.
In House H2, The boy Plays soccer for his school in Mexico and they recently have a newborn.

Can you prove that the probability of House-H1 having a girl child is more than that of House-H2?

Count the number of lines in the image below ?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Which tank will fill first?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

The horse jumps over the king.
Strangely there is absolutely no scratch on him.

Can anyone explain, how is this possible?