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

Below, you can see three complete equations and one incomplete. Based on the three complete ones, can you complete the incomplete one?

5 $ 4 $ 3 $ 9 = 4215
6 $ 9 $ 2 $ 6 = 3816
4 $ 7 $ 3 $ 3 = 1122
7 $ 2 $ 7 $ 4 = ____

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?

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

There was a strange boy who was born before his father. How can this be possible?

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

What always comes into a house through the keyhole?

I am a five-letter word and people eat me. If you remove the first letter I become an energy form. If you remove the first two letters, I am needed to live. Scramble the last three letters and I am a drink. What word am I?