You can buy 7 packs, because if you multiply 11x7 you would get 77. hope that helps
Answer:
Step-by-step explanation:20
200 books x 30 boxes = 6000 books
6000 books x 20 shipping crates = 120,000 books
Just keep multiplying
33=17x-18 add 18 both sides
51=17x. divide 17 both sides
3 = x