I am an odd number. Take away a letter and I become even. What number am I?

The more of this there is, the less you see. What is it?

10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

What always comes into a house through the keyhole?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

Which wheel of car does not rotate when you turn your car right?