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?

Look at the picture and find out which square is not linked with any of the other squares.

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

Replace the question mark with the correct number.

Which is heavier: a ton of bricks or a ton of feathers?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

At a Society election for president, precisely 963 votes were cast.
There is a total of 4 candidates that participate in the election.

The winning candidate exceeds the opponents by 53, 79 and 105 votes.

How many votes do each candidate gets?

Solve this riddle by finding the odd one out from the rest.

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?