Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

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

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

There was a competition where the contestants had to hold something. At the end of the event, the winner was a person who had no hands or feet. What was it that the contestants had to hold?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?