What is in seasons, seconds, centuries and minutes but not in decades, years or days?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

What does this rebus mean?

O
N
C
E
TIME

Which number should replace the question mark?

Which city is three-fifths chick two third cat and 50% goat?

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

What does this simple rebus mean?

A man is trapped in a room. The room has only two possible exits doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing dragon. How does the man escape?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?