I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

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 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Can you write down eight eights so that they add up to one thousand?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

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

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

If a wheel has 54 spokes, how many spaces are there between the spokes?