What goes up but never comes down?

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

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

While preparing the table for dinner, wife came up with an idea to tease his mathematician husband. She asked her husband to pick nine toothpicks and make ten without breaking any toothpick.

The husband was also smart and did it within seconds. How ?

The more you take me, the more you leave me behind.
Who Am I?

An octopus has 8 legs. A hippogriff has 6 legs and 2 pairs of wings. A sphinx has 6 legs and one pair of wings. Now we have all 3 kinds and a total of 18 insects in a cage. We have a total of 118 legs and 20 pairs of wings. How many insects do we have of each kind?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

What number do you get when you multiply all of the numbers on a telephone's number pad?

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