Which country gets ill every time?

Do You See It?

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 does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Once while in his court, King Akbar asked Birbal to write something on a wall that makes one sad when read in good times and makes one happy when read in sad times.

He took only a few moment and wrote something that fit the requirements. What did he write?

What word begins and ends with an E, but has only one letter?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?