Find out the missing number in the picture attached:

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

I have eight fingers and two thumbs but I do not live. What Am I?

What makes this number unique: 8,549,176,320?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

A man is lying dead in a field where no one is around. His head is split open and his legs are disfigured. Near to him, there is an unopened package. No living organism can be found anywhere at the crime scene.

How did he die?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?