If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.

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

What goes up but never comes down?

When it's bad luck to meet a black cat?

I make two people out of one. What am I?

I add 5 to 9 and get 2. The answer is correct, so what am I?

The captain of a ship is telling you an interesting story and then poses a question. He says, “I have travelled the oceans far and wide. One time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. Can you tell me how that was possible?”

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

The captain of a ship was telling this interesting story: "We travelled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly." How can that be possible?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?