This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

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?

The more it dries, the wetter it becomes. Can you tell what it is?

Remove two matchsticks to make the below equation correct.

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

How can you make a TV, a bed, a dog, and a car liquid?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?