Amanda is figuring out how many bags of grass seed she needs to buy to cover a new lot the city is turning into a park. The lot measures 120 feet by 60 feet. One section that measures 40 feet by 40 feet will be covered with concrete, and the rest needs to be covered in grass seeds. Each bag of grass seeds covers 56 square feet. How many bags of grass seeds does Amanda need?
First find the area of the lot by multiplying the width and the length: 120 ft * 60 ft = <<120*60=7200>>7200 sq ft.
Then find the area of the square covered in concrete: 40 ft * 40 ft = <<40*40=1600>>1600 sq ft.
Then subtract the concrete area from the total area to find the grassy area: 7200 sq ft - 1600 sq ft = <<7200-1600=5600>>5600 sq ft.
Finally, divide this area by the area each bag covers to find the number of bags: 5600 sq ft / 56 sq ft/bag = <<5600/56=100>>100 bags.
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