If eleven plus two equals one, what does nine plus five equal?

Can you find the missing piece of the Porsche?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

If an electric train is travelling south, then which way is the smoke going?

How many sides does a circle have?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

Before Mount Everest was discovered, what was the highest mountain in the world?

The dirtier I get, the whiter I look. Who am I?

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?