What does below rebus means ?

What runs around the whole yard without moving?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

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.

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

A man dies of old age on his 25 birthday. How is this possible?

Which country gets ill every time?

What has a bottom at the top?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

The following question it puts forth you:

25 - 55 + (85 + 65) = ?

Then, you are told that even though you might think it's wrong, the correct answer is actually 5!

Whats your reaction to it? How can this be true?