John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

10+10 and 11+11 can give you the same answer.

Explain how?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

What number do you get when you multiply all of the numbers on a telephone's number pad?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

What is harder to catch the faster you run?

What is red and smells like blue paint?

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?