What is black when you buy it, red when you use it, and gray when you throw it away?

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the painting?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Can you find the thief by just looking at the picture below?

I have an apple tree , number of apple in this tree get doubles every week.

On 30th week , the tree gets completely filled with apples :-)



Can you tell me , on what week does my tree is half covered with apples ?

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

How many times can you subtract the number two from the number fifty?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

The horse jumps over the king.
Strangely there is absolutely no scratch on him.

Can anyone explain, how is this possible?