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?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

What number when divided in half becomes zero?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

To attend world science seminar, A famous chemist from Mexico visit
London. In the lab, the scientist was killed and his six assistants were under suspicion of killing the chemist.
Name of six assistants: Austin, Wayne, Dege, Oscaru, Lingard, and Rojo.
He left a note "76-20-44 79-16-22-7"

A local detective Jack was called to solve the case,

After reading the note, Jack instantly asked the police to arrest the murderers.

Who are the murderers?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

How many times can you subtract the number two from the number fifty?