Math CentralQuandaries & Queries


Question from Deb, a parent:

I need to know how many tons of dirt(6 inches deep)would it take to cover 8 acres?


According to this document at the US NIST, the average density of dirt is 120 lbs per cubic foot. Only you and your dirt supplier know whether this is correct for the kind of dirt you are planning to use.

Since each inch is 1/12 of a foot and each acre is 43560 square feet, and each pound is 1/2000th of a ton, you have

(6 / 12) x (8 x 43560) x (120 / 2000) tons.

That's over 10 000 tons of dirt.

Stephen La Rocque.>

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