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| Math Central | Quandaries & Queries |
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Question from Mark, a student: there are 30 cubic yards of concrete, how many feet will it cover with a 4" slab? |
Hi Mark,
The volume of a rectangular slab in cubic yards is length × width × thickness where the three dimensions are measured in yards. You have a thickness of 4 inches which is 4/39 = 1/9 yards and hence
length × width × 1/9 = 30 cubic yards.
Thus
length × width = 270 square yards.
Convert this to square feet.
Penny
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