What does an Island and the letter T have in common?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Why is it against the law for a man living in Delhi to be buried in Mumbai?

What has a bottom at the top?

It belongs to you, but other people use it more than you do. What is it?

Consider this about a word: The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

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?

There are two words one resembles the "state of rest" and the other is related to "writing/reading material".

Can you name these two words which also sound similar?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?