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?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

"That Restaurant always remains crowded. This is the reason why nobody goes there".

Can you find a flaw in this statement?

Be active and find the killer in the picture Riddle below.

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

Using eight eights and addition only, can you make 1000?

O_er_t_o_

Complete the missing letters of the given word.

Identify the 10 differences between the two given pictures.

Complete the table series riddle by finding the number that can replace "??".

What 5-letter word typed in all capital letters can be read the same upside down?