Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

What kind of band never plays music?

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

Can you find a number that lies one third of the distance between 1/3 and 2/3?

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?

What 5-letter word typed in all capital letters can be read the same upside down?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

How many times can you subtract the number two from the number fifty?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

What does this Rebus Picture mean?