Question

Three boxes of cereal cost $9.57. How much do five boxes cost

Answer 1

the question is 9.57 × 5

Answer 47.85

Answer 2

Well, not quite to the answer before this. This is a proportion. Divide 9.57 by 3- you get 3.19. This is how much it costs for one box. Now, multiply 3.19 by 5; 15.95 is your answer. It costs $15.95 for 5 boxes of cereal.
Hope this helps! :D