The more of this there is, the less you see. What is it?

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?

If six children and two dogs were under an umbrella, how come none of them got wet?

Before Mount Everest was discovered, what was the highest mountain in the world?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

Can you solve this picture maths equation?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

I make two people out of one. What am I?