Math CentralQuandaries & Queries


Question from rick:

I have a bag of concrete that will cover .525 cubic feet of space.
How many square feet will the same bag cover?

Hi Rick,

The answer depends on the thickness of the concrete. The volume (in cubic feet) is the surface area (in square feet) times the thickness (in feet). Hence take the thickness you want for the concrete (in feet) and divide that number onto 0.525 to find the area (in square feet) that you can cover. For example if you want the concrete to b 2 inches thick that is 2/12 = 0.167 ft thick, and 0.525/0.167 = 3.15 square feet.

I hope this helps,

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