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To calculate the number of 80-pound bags of concrete needed for a 2x2 slab that is 6 inches thick, first determine the volume of the slab. The volume is 2 feet x 2 feet x 0.5 feet (6 inches) = 2 cubic feet. An 80-pound bag of concrete typically yields about 0.6 cubic feet. Therefore, you would need approximately 4 bags (2 cubic feet ÷ 0.6 cubic feet per bag = about 3.33 bags, rounded up to 4).

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2w ago

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