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?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

What is wrong in the below Picture?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

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

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

You see me once in June, twice in November, and not at all in May. What am I?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?