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?

Why do you find that most of the buildings are deprived of the 13th floor?

Why 1729 is a magic number? Answer Logically.

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

What is at the end of a rainbow?

What do you call a fish without an eye?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

Identify the next two numbers in this series.

101, 112, 131, 415, 161, 718, ???, ???