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

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

One night, Louis and Adam were sitting together. Adam was watching a movie while his wife Louis was reading a mystery book. Suddenly the power went out and Adam decided to go to bed, but strangely Louis kept on reading. There was no artificial light around, so Louis kept on reading. How come?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

Kohli and Dhoni decided to have a paintball match.
Kohli told Dhoni, "Sir it is not right as you got thrice the paintballs I have".

Dhoni instantly gives Kohli 10 hit paintballs.
Kohli replied, "Sir, I believe you still have twice the paintballs than I have".

Dhoni gives "?" more paintballs to Kohli.
Kohli replied, "Sir it is even now, Let us have a match".

What is "?".

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

Which famous Hollywood movie name is hidden in the below rebus?

If eleven plus two equals one, what does nine plus five equal?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?