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?

What runs around the whole yard without moving?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

I travel all around the world but always stay in the corner. What am I?

In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.

Can you find the hidden animal in the picture below?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

When can we add 2 to 11 and get 1 as the correct answer?

Count the Triangle in the figure given below:

How many letters are in the alphabet?