Can you find the missing piece of the Porsche?

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

How many times can you subtract the number 5 from 25?

What is the riddle which can be asked all day with a different correct answer each time.

What has to be broken before you can use it?

What is the Surname of Barbie Doll?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

I can sizzle like bacon,
I am made with an egg,
I have plenty of backbone, but lack a good leg,
I peel layers like onions, but still remain whole,
I can be long, like a flagpole, yet fit in a hole.