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Imagine a cube 3' x 3' x 3' . that is a cubic yard. I believe a bag is 1/3 of a yard.

No It's less than that one 94 lb bag of Portland cement is one cubic foot. And there are 27 cubic feet in a cubic yard ( 3*3*3 = 27) so an 80 lb bag of premix is a little less than 1/27th

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Q: How many cubic yards in a 80lb bag of concrete?
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