What's my number?
clue 1: my number is a multiple of 5 and is less than 50
clue 2: my number is a multiple of 3.
clue3: my number is exactly 8 factors

Your answer is 30.
Its a multiple of ten, less than 50, multiple of 3, exactly 8 factors.

From Clue 1:  Number is 5 , 10 , 15, 20, 25, 30, 35, 40, or 45.        Since it is less than 50.

From Clue 2: Multiple of 3:  15 or 30 or 45 is a multiple of 3.  So it is 15 or 45.

From Clue 3:

Factors of 30 = 1, 2, 3, 5, 6, 10, 15, 30.

The  number is 30 base on the clues.

I hope this helps.

1. y=32. x=-13. n=-40