What country can make you shiver?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

If,

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

Then

4 / 5 = ?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

How can you take 2 from 5 and leave 4?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?

What is full of holes but still holds water?

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

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

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?