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Kendra used 225 cubic feet of concrete to make her new patio. The patio is a rectangular concrete slab and measures 25 feet by 18 feet. How thick is the concrete slab?

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This problem clearly states how to solve it. Use the information you already know to solve.

25*18*x = 225
x = 225/(25*18) = 225/450 = 1/2 ft

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