What does does this rebus picture means ?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

Why do people go to bed?

You are given 2 eggs.
You have access to a 100-storey building.
Eggs can be very hard or very fragile means it may break if dropped from the first floor or may not even break if dropped from 100th floor, Both eggs are identical.
You need to figure out the highest floor of a 100-storey building an egg can be dropped without breaking.
Now the question is how many drops you need to make. You are allowed to break 2 eggs in the process

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

If your uncle’s sister is not your aunt, what relation is she to you?

Which city is three-fifths chick two third cat and 50% goat?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

You are confined in a room and given two metal rods. Out of these two rods, one is magnet and the other is the iron rod. They look starkly similar. You don't have any other metal object in the room.

How will you decide which one of those is magnet?