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

Explain how?

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

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?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

What does below Rebus say?

XLR8

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?

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

Can you solve the photo plexer logic ?

Find the number of squares in the below picture

What always comes into a house through the keyhole?