A rectangular lawn is 40m wide and 60 m long. Stuart mows all the way along the perimeter of the lawn, leaving only 1,500 square meters to be mowed in the center of the lawn. How wide is the strip of lawn that Stuart has already mowed?

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Hell0 wrote:A rectangular lawn is 40m wide and 60 m long. Stuart mows all the way along the perimeter of the lawn, leaving only 1,500 square meters to be mowed in the center of the lawn. How wide is the strip of lawn that Stuart has already mowed?

Draw the rectangle with a smaller one inside for the unmowed part. Writ the dimensions on the larger rectangle. Put a variable (like "s" for the "strip" that's been mowed) in the bits between the two rectangles. Use this to figure out how to label the smaller inside rectangle. Once you get this, you can multiply the length and width and put this equal to the area they gave you. Solve for "s". Don't forget to put "meters" on your answer!