Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

What you cannot hold but it is yours?

A boy purchased a book from a bookkeeper and gave him $100.
The cost of the book is $50 but the bookkeeper has no change, so he gets the change from the next shop and returns the boy his $50.

After some time the next shopkeeper came with the $100 note and told the bookkeeper that the note was a fraud, so he took the money back.

How much loss did the bookkeeper face?

Steffi's daughter Jazelle needs to be picked up from school every day.
Steffi asks one of her colleagues to pick up Jazelle from the school. Steffi devised a password system to confirm that Jazelle goes with the correct colleague only.

The password on Monday was SJM16.
The password on Wednesday was TAW39.

What will the password be for Friday?

In the four images below, can you find the odd one out?

Why is the Hole below a Lock?

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

Spot what is wrong here in below Picture?

Find the Odd One Out?
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If you say my name, I will no longer exist. What am I?