Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

Why is the Hole below a Lock?

Imagine a box with two cogwheels, one big with 24 teeth and one small with 8 teeth. The big one is firmly attached to the center of the box which means it does not turn or move while the small one rotates around the big one.

How many times do you think that the smaller wheel will turn compared to the box when it turns once around the big one?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

A blonde put eyeliner on her head. Why?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?