Which number should replace the question mark?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different. How do you measure 45 minutes?

Why is 6 afraid of 7?

What goes through cities and fields, but never moves?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

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