My location can be determined by the below rebus.
So where am i ?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

What is the centre of gravity?

Count the number of triangles in the given picture.

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

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

John is found dead in a bare field. Nobody killed John,
John did not commit suicide.

Inspector Jacob found a bag just a few meters away from John which could save his life. What was in the bag?

What has a ring but no finger?

Two old friends, Jack and Jill, meet after a long time, and discussing as:

Jack: Hey, how are you, man?

Bill: Not bad, got married and I have three kids now.

Jack: That's awesome. How old are they?

Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.

Jack: Cool..But I still don't know.

Bill: My eldest kid just started taking piano lessons.

Jack: Oh, now I get it.

How old are Bill's kids?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.