By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

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

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

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?

On a magical land of Mexico , all the animal in the land are rational.

There are 10 tigers and one goat.
Tiger can eat goat but since it's a magical land , the tiger who eats the goat , turns into goat and then can be eaten by the remaining tiger(s).

If we leave them for some time then how many goat and tiger will be there , when we come back ?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

What does below Rebus say?

XLR8

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

A donkey is behind another donkey
I'm behind that second donkey
But there is a whole nation behind me

It is a murder you can describe in a word.