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 more useful when it is broken?

John was born on March 5, 1970, in Delhi, India. Jacob was born 25 days before John. The year when they took birth, Republic Day fell on Monday.

Can you find out on what day was Jacob born?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

What is the coolest letter in the alphabet?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

What is the next number in the series?

15 29 56 108 208 ?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

No matter how little or how much you use me, you change me every month. What am I?

How can you write nineteen in a manner that if we take out one, it becomes twenty?