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?

The Little ant seems to be always confused. Do you know why?

Can you name four days which start with the letter 'T'?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

What is common among 11, 69, and 88?

Can you make the number 24 by utilizing the numbers 1, 3, 4 and 6? You must use one number only one time and you can use mathematical operation symbols anytime anywhere.

What number do you get when you multiply all of the numbers on a telephone's number pad?

What's the only room from which no one can enter or leave