What does an Island and the letter T have in common?

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?

Sherlock breaks into a crime scene. The victim is the owner who is slumped dead on a chair and have a bullet hole in his head. A gun lies on the floor and a cassette recorder is found on the table. On pressing the play button, Sherlock hears the message 'I have committed sins in my life and now I offer my soul to the great Lord' and followed a gunshot Sherlock smiles and informed the police that's its a murder.

Why did he think so?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

You bought me for dinner but never eat me. What am I?

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