Find out the missing number in the picture attached:

Which number should replace the question mark?

What Adam and Eve do not have but the rest of the people have?

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

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?

What is black when you buy it, red when you use it, and gray when you throw it away?

John is a strange liar.

He lies on six days of the week, but on the seventh day, he always tells the truth.

He made the following statements on three successive days:

Day 1: "I lie on Monday and Tuesday."
Day 2: "Today, it"s Thursday, Saturday, or Sunday."
Day 3: "I lie on Wednesday and Friday."

On which day does John tell the truth?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

Can you solve this picture maths equation?

Can you write down eight eights so that they add up to one thousand?