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To calculate the amount of concrete needed for a 30'x40' slab, you first need to determine the thickness of the slab. For example, if the slab is 4 inches thick, convert the dimensions to feet (30' x 40' x 0.33' for 4 inches). Then, multiply the length, width, and thickness: 30 x 40 x 0.33 = 396 cubic feet. To convert cubic feet to cubic yards, divide by 27, resulting in approximately 14.67 cubic yards of concrete needed.

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2d ago

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