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?

What occurs twice in a week, once in a year but never in a day?

Can you find the hidden animal in the picture below?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

What is common among 11, 69, and 88?

Can you find out the total number of triangles in the given figure?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

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

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?