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

There is a place where if I stand up straight, I will still be considered sideways.

At a bar, three friends, Mr Green, Mr Red and Mr Blue, were having a drink. One man was wearing a red suit; one a green suit; and the other a blue suit. 'Have you noticed,' said the man in the blue suit, 'that although our suits have colours corresponding to our names, not one of us is wearing a suit that matches our own names?' Mr Red looked at the other two and said, 'You're absolutely correct. What colour suit is each man wearing?

A mad serial killer kidnaps people and forces them to play the game of 2 pills with them, In this game, there are pills in the table and one of them is normal pill while the other one is deadly poisonous.
The victim will choose one pill and the killer will pick the other pill and both simultaneously will swallow the pill with water.
victim dies every time.

One day the serial killer kidnaps the Joseph and forces him to play the same game with him.

Joseph solves the mystery of the two pills and remains alive.

Explain?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?