To determine how many 40 lb bags of topsoil are needed to cover 12 cubic yards, first convert cubic yards to cubic feet. There are 27 cubic feet in a cubic yard, so 12 cubic yards equals 324 cubic feet. Assuming a 40 lb bag covers about 1.5 cubic feet, you would need approximately 216 bags (324 cubic feet ÷ 1.5 cubic feet per bag = 216).
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