What is the next number in this series?

4,12,84,3612....

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

Can you start the fire using two pieces of wood?

Give it food and it will live; give it water and it will die.

Six people park their car in an underground parking of a store. The store has six floors in all. Each one of them goes to a different floor. Simon stays in the lift for the longest. Sia gets out before Peter but after Tracy. The first one to get out is Harold. Debra leaves after Tracy who gets out on the third floor.

Can you find out who leaves the lift on which floor?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Who always enjoys poor health?

John was going on a jungle trip. He asked his wife to pack something to eat, something to drink and something to burn if he feels cold in the jungle. When John opens the backpack he found just one thing in the bag. What was it?