Replace the question mark with the correct number in the below-given picture?

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

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.

Move four matchsticks to the below square to form three squares?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?

A man dies of old age on his 25 birthday. How is this possible?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?