How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

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?

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?

What always comes into a house through the keyhole?

What is the word or phrase?

You are playing as white and given four rooks to checkmate the black king in four moves with the following rules 1. You can place one rook every move and ensure the black king should be in check position.2. After four moves the black king should be in the checkmate position.

Can you count the number of blocks in the picture below?

A non-stop marathon is the shared favourite sport of three brothers.

*The oldest one is fat and short and trudges slowly on.
*The middle brother's tall and slim and keeps a steady pace.
*The youngest runs just like the wind, speeding through the race.

"He is young in years, we let him run!" the other two brothers explained, "'because though he is surely number one, he is second, in a way." Why is it?

What number when divided in half becomes zero?

Give it food and it will live; give it water and it will die.