I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

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

AB * C = DE - F = GH / I

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

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

There is a unique number which when multiplied by any number from 1 to 6, we will get the new number that contains the same digits only.

Can you find that number?

A dying old man wants to divide his entire land between his only two sons. Since his only wish is to treat them as equal as both of them have been too good to him, he wants to divide his land equally between them. The problem is that the land is significantly irregular in shape and thus there is no choice of cutting them into two equal halves.

Can you help him divide the land in a manner that both of his sons will be happy?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

What can you see in the middle of March and April that you can never see in any other month?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100