Find the hidden tiger in the given optical illusion ?

I cannot talk, but I always reply when spoken to. What am I?

If eleven plus two equals one, what does nine plus five equal?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Can you count the number of squares in the figure below?

Replace the question mark with the number below given a simple math problem.

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?

Find the hidden panda in the image below.

Who has married many women but was never married?

You have $100 with you and you have to buy 100 balls with it. 100 is the exact figure and you can't go below or above the numbers and you have to use the entire $100. If there is no kind of tax applied how many of each of the following balls will you be able to buy:

Green Balls costing $6
Yellow Balls costing $3
Black Balls costing $0.10

Now, how many of each must you buy to fulfil the condition given?