Question

Steven has some money if he spends nine dollars then he will have 3/5 of the amount he started with

Answer 1

X - 9 = 3/5x 
x - 0.6x = 9
0.4x = 9
     x = 22.5
22.5 - 9 = 13.5

Therefore, Steven will have $13.50. 
Im not entirely sure. You have to recheck this with someone else. Im having a brain fart right now lol

Answer 2

Total money * fraction = part
$x* \frac{3}{5} =9 \\ ( \frac{5}{3}) * \frac{3x}{5} = 9* \frac{5}{3} \\ x= \frac{45}{3} =15$