Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

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 has no start, end, or centre?

What has hands, but can’t clap?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

What is the word or phrase below?
R | E | A | D

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

What does a man do only once in his lifetime, but women do once a year after they are 29?

A boy was driving a car, a girl took a lift from her. She asked his name. The boy said - my name is hidden in my car’s number, find it if you can. After this, she got down Car number was [ WV733N ] Can you guess the name now?