Answer: I believe it would be no solution
Step-by-step explanation
I think this answers all the parts
Hope this helped :)
Because it's a multiplication, we can choose this:
72=8x9
You must trade in 3 books to gain 2 from the store. If she brings 18 books, 18/3 shows that she can turn in 6 "groups" of 3 books. Each "group" gets her 2 books, and since 6*2=12 she can get 12 books from the store.