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

There was a minor accident with a doctor's son but the doctor noticed no major injury. After the treatment, the father of that doctors son is sitting with the son of the doctor without the doctor being in the room.

How can this be possible?

I can be cracked, made, told, and played. What am I?

Can you find out the missing number in the grid?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Replace the question mark with the number below given a simple math problem.

You are an expert on paranormal activity and have been hired to locate a spirit haunting an old resort hotel. Strong signs indicate that the spirit lies behind one of four doors. The inscriptions on each door read as follows:

Door A: It's behind B or C
Door B: Its behind A or D
Door C: It's in here
Door D: It's not in here

Your psychic powers have told you three of the inscriptions are false, and one is true. Behind which door will you find the spirit?

Open a Laptop which is password protected. Hint for the password is given as below:

1 mobile 3 books 2 Boards 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?