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

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

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

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

I am a ten letters word
The first four letters have the power to rule,
Next, four-letter can be eaten.
The next three-letter represents a lady.
I can fly as well

what am I looking for?

What is both possible and impossible at the same time?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

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

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

All of the flowers I have are orchids except two. All of the flowers I have are hibiscuses except two. All of the flowers I have are roses except two.

Can you tell me how many flowers I have?