The more of this there is, the less you see. What is it?

The centre of the third figure is empty. What digit should fit inside?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

You have two jars of chocolates labelled as P and Q. If you move one chocolate from P to Q, the number of chocolates on B will become twice the number of chocolates in A. If you move one chocolate from Q to P, the number of chocolates in both the jars will become equal.

Can you find out how many chocolates are there in P and Q respectively?

What has many keys but can’t open a single lock?

Before reading ahead, you must know the fact that only one of the people here is telling the truth.

A says that B is lying.
B says that C is lying.
C says both A and B are lying.

Can you find out who is speaking the truth?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

I welcome the day with a show of light, I stealthily came here in the night. I bathe the earthy stuff at dawn, But by noon, alas! I'm gone.