Can you replace the question mark with the correct number?

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?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Imagine you are in a room with no windows or doors. How will you get out?

A Child was born in Lahore, Pakistan. Still, the child is not a Pakistani citizen. why?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

What can you hold in your right hand, but never in your left hand?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?