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

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

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

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different. How do you measure 45 minutes?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Why do we preferably have round manhole covers and not square ones?

In a football game, Christina defeated Teresa by 2 - 0 but no man from either side scored. How can this be possible?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

What always comes into a house through the keyhole?