Math CentralQuandaries & Queries


Question from Duncan:

I'm trying to figure out how much area 1 cubic yard of gravel would cover at a depth of 2 inches? I've asked around and have many different answers.

Hi Duncan.


A cubic yard of gravel is one yard × one yard × one yard, perhaps looking like this:


If we slice it into 2 inch slices, we have 36/2 = 18 slices, each of them 2 inches thick, with a top surface that measures one yard × one yard hence with an area of one square yard.



So if we just lay them out, the total area is 18 × 1 yard2 = 18 yards2.

Hope this helps,

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