If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

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?

I make two people out of one. What am I?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

Which point will the car reach to go out?

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

What is more useful when it is broken?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?