math related algebra

Question

Amy was asked to multiply a number by 8 and then add 5. Instead, she added 8 to the number and then multiplied the result by 5. This gave her 2015. What would the answer have been if Amy had followed the instructions correctly?

Answer 1

(x+8)5 = 2015

x+8 =2015/5

x+8 = 403

x = 403-8 = 395

8x + 5 = 8(395)+5 = 3160+5 =3165

correct answer was 3165