The perimeter of a rectangle is 80cm, and the ratio of length to width is 5:3. What is the area of the rectangle?

Length: 80 △ 2 × 55 + 3 = 40 × 58 = 25 (CM), 80 △ 2 × 35 + 3 = 40 × 38 = 15 (CM), area: 25 × 15 = 375 (square cm); answer: the area of this rectangle is 375 square cm

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