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?

Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

I have feet, but no legs. Which animal Am I?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

Can you solve below mathematical equation?

2^1234 - 2^1233

Prove that the below maths equation is true.

8 + 8 = 91

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

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

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?