Chapter 7.5, Problem 6P

Suppose that you have two square garden plots: One is 10 feet by 10 feet and the other is 15 feet by 15 feet. You want to cover both gardens with a 1-inch layer of mulch. If the 10-by-10 garden took $3\frac{1}{2}$ bags of mulch, could you calculate how many bags of mulch you’d need for the 15-by-15 garden by setting up the following proportion

   $\frac{3\frac{1}{2}}{10}=\frac{x}{15}$

Explain clearly why or why not. If the answer is no, is there another proportion that you could set up? It may help you to make drawings of the gardens.