Question

Amy was asked to multiply and 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

Answer 1

The equation is:
2015÷5-8
The awnser is 395
Take 395×8+5
That leaves the awnser 3165

Answer 2

she did (x+8)*5

2015 = (x+8)*5

divide both sides by 5

403=x+8

x = 403-8 = 395

using same number if she followed instructions it would be

395*8 =3160+5 = 3165