The density and strength of concrete are determined by the ratio of cement and aggregate (aggregate is sand, gravel, or crushed stone). suppose that a contractor has 420 ft^2 of a dry concrete mixture that is sand by volume. how much pure sand must be added to form a new mixture that is sand by volume?

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05-09-2022
Mathematics

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The density and strength of concrete are determined by the ratio of cement and aggregate (aggregate is sand, gravel, or crushed stone). suppose that a contractor has 420 ft^2 of a dry concrete mixture that is sand by volume. how much pure sand must be added to form a new mixture that is sand by volume?

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