Replace the question mark with the correct number.

You need to move three matchsticks to form three squares. Can you do it?

What is harder to catch the faster you run?

I have branches, but no fruit, trunk or leaves. What am I?

I am quite hot but become too cold if you remove the first two letters. What am I?

A pack of cards has 40 cards. You are blindfolded. Out of 40, 25 cards are facing down while 15 are facing up. You have been asked to divide this pack of cards into two decks - so that each deck contains an equal number of face-up cards. Remember, you are blindfolded.

How will you do it?

We are a group of eight brothers. We consider the weak, yet we protect the king in every battle. If we move ahead, we never turn back. Who are we?

A sundial has the fewest moving parts of any timepiece. Which has the most?

Prove that twice of ten is the same as twice of eleven.

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?