1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Solve the rebus riddle in the picture below.

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

Who is He ?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

Check out the number list below and find what number comes next in the sequence.

111 , 113 , 117 , 119 , 123 , 137 , ?

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?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

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?

Prove that twice of ten is the same as twice of eleven.

Why 1729 is a magic number? Answer Logically.