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?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

At the local model boat club, four friends were talking about their boats.

There were a total of eight boats, two in each colour, red, green, blue and yellow. Each friend owned two boats. No friend had two boats of the same colour.

Alan didn't have a yellow boat. Brian didn't have a red boat but did have a green one. One of the friends had a yellow boat and a blue boat and another friend had a green boat and a blue boat. Charles had a yellow boat. Darren had a blue boat, but didn't have a green one.

Can you work out which friend had which coloured boats?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

What has one eye, but can’t see?

There are forty elephants and they have forty-fore heads. How can this be possible?

What does does this rebus picture means ?

What does Alexander the Great and Winnie the Pooh have in common?