John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

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

From a pack of 52 cards, I placed 4 cards on the table.

I will give you 4 clues about the cards:

Clue 1: Card on left cannot be greater than the card on the right.
Clue 2: Difference between the 1st card and 3rd card is 8.
Clue 3: There is no card of an ace.
Clue 4: There are no face cards (queen, king, jacks).
Clue 5: Difference between the 2nd card and 4th card is 7.

Identify four cards?

Find the missing number in the sequence below:

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

What is the next number in this series?

4,12,84,3612....

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

I was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?