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Anonymous
If you mean cubic yards, multiply by 27. 3 X 27 = 81. Concrete is sold the yard, but that really means cubic yards.
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A cubic yard is 3'X3'X3' or 27 cubic feet. 3 cubic yards would be 3 cubic yards x 27 cubic feet /yard = 81 cubic feet
3 x 3 x 3 x 7