Answer: I think you've got it! A bag could cover 12000 sqft at a pound rate, but we need a three pound rate. So we divide the square footage per bag by three. That gives us the 4000 sqft per bag. Using 4000 per bag, and knowing we have 20000 to cover, we divide 20 000 by 4000 to get five -- the number of bags we need.
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