Can you find a number that lies one third of the distance between 1/3 and 2/3?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

When monkey rotate the gear, which mark will be hit 1 or 2 ?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

Who is that with a neck and no head, two arms and no hands? What is it?

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?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

Can you start the fire using two pieces of wood?

Take one out and scratch my head, I am now black but once was red. What am I?