Question

Melanie sold half of her comic books and then bought 9 more. She now has 17. How many did she begin with?

Answer 1

The answer is = 16
I solved by the one variable one grade

Answer 2

16

Explanation:

You need to work backwards and do the opposite

So, first do subtraction since Melanie added to her collection. SO do the opposite of addition.

17-9=8

Then, since she sold half of her comics, and she is dividing her collect, you multiply 8 with 2.

8 x 2=16

Final answer

16 comics