Question

Mr. Malone used 40 pounds of insecticide to cover 1,760 square feet of lawn and 60 pounds to cover an additional 2,640 square feet. how many pounds of insecticide would Mr. Malone need to cover his whole lawn of 4,480 square feet?

Answer 1

1760/40 = 44
He covered 44 ft^2 per lb.

2640/60 = 44
Again, he covered 44 ft^2 per lb.

In both cases, he covered 44 square feet per pound.
To cover 4480 sq ft, he needs:

4480/44 = 101.818181... = 101 9/11 pounds