If 5 times a number n is subtracted from 15, the result is negative

If 5 times a number n is subtracted from 15, the result is negative. Which of the following gives the possible value(s) for n ?

1. 0 only
2. 3 only
3. 10 only
4. All n > 3
5. All n < 3

Answer

The correct answer is D.

The phrase "5 times a number n: can be represented as 5n. If this is subtracted from 15, the expression 15 - 5n represents the result.

15 - 5n < 0

15 < 5n

3 < n

n > 3