3. Donna orders boxes of batteries for calculators in the math class she teaches. She knows that the number of batteries she gets, n, is proportional to how many boxes, b, of batteries she buys. In previous years she has recorded the following: number of boxes, b 11,15,21 number of batteries, n 44,60,84 What is the ratio of the number of batteries to the number of boxes? What does it represent?​