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?

Why is the Hole below a Lock?

Find the number of squares in the below picture

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?

Imagine you are in a room with no windows or doors. How will you get out?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

Which flower has two lips?

What is always in front of you but can’t be seen?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?