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?

What number when divided in half becomes zero?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Can you identify the Oscar-winning movie from the rebus below?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

How can I get the answer 24 by only using the numbers 8,8,3,3?

You can use the main signs add, subtract multiply and divide.

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

What can go up a chimney down, but can’t go down a chimney up?

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

Find the next number in the following series:
6, 14, 26, 98, __?