Where do you go to learn how to make ice cream?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

Find the last number in the series below:

voN luJ yaM raM ---

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

I shave every day, but my beard stays the same. What am I?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

Which tank will fill first?

What does this below rebus puzzle mean?

A mules travels the same distance daily.
I noticed that two of his legs travels 10km and the remaining two travels 12km.
Obviously two mules legs cannot be a 2km ahead of the other 2.

The mules is perfectly normal. So how come this be true ?