I am white when I am dirty, and black when I am clean. What am I?

John, a 5-year-old boy, was really fond of the chocolates. He asked his Mother to give him some money to buy his favourite chocolates. His Mother gave him $45. He went to the shopkeeper and asked, "How much is one chocolate for?". The shopkeeper said $3 for one chocolate. Also, if you give me the wrappers of three chocolates, I will give you one for the exchange.
In total, how much chocolate could John eat?

The more it dries, the wetter it becomes. Can you tell what it is?

Prove that twice of ten is the same as twice of eleven.

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

What two things can you never eat for breakfast?

How can one talk without saying a single word?

How far can you walk into the woods?

Solve below rebus puzzle?

I have no life, but I can die. What am I?