Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

Imagine you are in a room with no windows or doors. How will you get out?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

A kind heart person buy packed food at 3$/packet from United states and sells them at 1$/packet at Africa. After some time he becomes a millionaire.

How come the guy become millionaire ?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

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

If eleven plus two equals one, what does nine plus five equal?

Why did the Girl throw the butter out of the window?

A man is found hanging dead from the ceiling of a room. The room’s dimensions are 15 x 15 x 15. The man is only 6ft tall and the rope was only 2ft long. There are no windows and only one door to the room. The door is bolted shut from the inside, and a puddle of water is under the man. How did he kill himself?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?