A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

what does the below rebus means?

When can we add 2 to 11 and get 1 as the correct answer?

Can you write down eight eights so that they add up to one thousand?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

You need to move three matchsticks to form three squares. Can you do it?

You have an empty wine bottle with a cork that has been secured at the top in a normal way. There is a metal ring inside the bottle that is suspended by a string.

How can you make the metal ring drop to the bottom if you are not allowed to touch anything - not the bottle, not the cork, not the thread and not the ring?