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?

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

For this puzzle, you might have to find logic in something illogical. But hey, it's fun and a healthy little break from your strenuous puzzle-solving sessions.

Can you decipher the meaning in the following cluster of letters?

ITIT,NCENTCENT

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

It is a 5 letter word if you take away first letter it is something you get from sun, if you remove second letter you will get something to eat, if you remove third letter you get a word you use in pointing at and if you remove the fourth letter you get something to drink. What is it?

What is next number in the pattern below:

131 517 192 123 ?

Which alphabet is a part of our body?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

What is the next number in the series?

15 29 56 108 208 ?