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40x68x36=97,920 in.^3 1728in.^3 per 1ft^3 in volume 97920/1728=56.7 ft^3 of concrete in volume 27ft^3 per 1 Yd^3 in volume 56.7/27=2.1 yd^3 of concrete to fill the hole You can not order exactly 2.1 yards of concrete though. I think they only go up by half yard increments.

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16y ago

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