Question

Toni can carry up to 18 Ib in her back pack her lunch weighs 1 lb her gym clothes weigh to 2lb and her books (b) 3lb each how many books can she carry in their backpack?

Answer 1

1 + 2 + 3b = 18
3 + 3b = 18
3b = 18 - 3
3b = 15
b = 15/3
b = 5...she can carry 5 books