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?

Can it be possible to build a house that has all its four walls facing towards the South?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Why did the Girl throw the butter out of the window?

You need to move three matchsticks to form three squares. Can you do it?

What seven-letter word has hundreds of letters in it?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

Can you write down eight eights so that they add up to one thousand?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?