I have teeth but i don't bite. Who Am I ?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

What occurs twice in a week, once in a year but never in a day?

Using Only Five 5's and any mathematical operator make sum as 37

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

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

Can you find out the total number of triangles in the given figure?

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?

How far can you walk into the woods?

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?

Next Number in the Series,

5, 16, 49, 104, ?