When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

What month of the year has 28 days?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

I die but do not live. What am I?

I know a nine-letter word having only one vowel.
Do you ?

The dirtier I get, the whiter I look. Who am I?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?