A circular garden has a diamter of 12 feet. How many bags of topsoil must linda buy to cover the garden if one bag covers an area of 3 square feet? Is the answer 38 or 12? The "3 square feet" part confused me..

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38 is the right answer. By "3 square feet", they mean there are 3 units of area (square feet). The word square applies to 'feet', not the 3.