Question

If 9 less than 3 times a number is 15, what is the number?

Answer 1

It's 8.

3x-9=15

(3*8)-9=15

Answer 2

8

Explanation:

You want a number such that 9 less than 3 times the number is 15.

Setup

Let n represent the number. Then 3n is 3 times the number, and 9 less than that is ...

3n -9 = 15

Solution

Adding 9 gives ...

3n = 24

n = 8 . . . . . divide by 3

The number is 8.

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