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This question comes from EDM100 problem solving for college students

The Johnson's have a 27ft by 20ft lawn. They want to pour concrete for a sidewalk 4 ft wide around the lawn. To make the mold for the concrete, they will need to buy some lumber. How many feet of lumber will they need to buy in order to make the required mold for the perimeter of the walk?

Was wondering if you have to use the formula for perimeter here? P=2L+2W?

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