Replace the question mark with the correct number.

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

You order chicken wings at KFC in the boxes of 6, 9 and 20. What is the largest number of wings that you cannot obtain by buying in any combination of the boxes?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

What is the next number in this matchsticks series riddle?

The centre of the third figure is empty. What digit should fit inside?

What is the Surname of Barbie Doll?