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?

A man was found murdered on Sunday morning. His wife immediately called the police. The police questioned the wife and staff and got these alibis: The Wife said she was sleeping. The Cook was cooking breakfast. The Gardener was picking vegetables. The Maid was getting the mail. The Butler was cleaning the closet. The police instantly arrested the murderer. Who did it and how did they know?

What number should come in place of the question mark below?

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

A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

What is the next number in this matchsticks series riddle?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

What is red and smells like blue paint?

I always drive my customer away.

Who am I?