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| Math Central | Quandaries & Queries |
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Question from dianna, a parent: This is a 2-fold question. I am getting some mulch that is measured in 1 cubic yard for $25.00. Thanks, |
Hi Dianna.
1 cubic yard = 1 (yard)3. Since each yard = 3 feet, 1 cubic yard = 1 (3 feet)3 = 27 feet3. So a cubic yard is 27 cubic feet.
The first price is $25 for 27 cubic feet, so that works out to $0.93 per cubic foot.
Walmart's price is $3 for 2 cubic feet, so that works out to $1.50 per cubic foot.
Clearly, by buying in larger quantities you get a better price.
How much to buy depends on the depth you plan. Each inch of depth is 1/12 of a foot, so each inch of depth requires 376/12 = 31.33 cubic feet. Multiply the number of inches by 31.33 to get the number of cubic feet you will need to purchase.
Hope this helps,
Stephen La Rocque.
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