It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

A bomb exploded in a room full of married couples and no one died. How?

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

Imagine you are in a room with no windows or doors. How will you get out?

What goes up but never comes down?

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?

An artist while painting a scenic beauty, decides to paint three layers of blue colour on the sky.

Which layer will go on the first?

What number should come in place of the question mark below?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?