Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

What does the below image rebus riddle means ?

How many letters are in the alphabet?

How many Watermelons are there in the below picture?

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?

What has a ring but no finger?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?