For a rectangle, its length is reduced by 5cm, or its width is reduced by 4cm, and its area is reduced by 40 square centimeters. What is the area of this rectangle

Width = 40 △ 5 = 8 (CM)
Length = 40 △ 4 = 10 (CM)
Rectangle area = 10 × 8 = 80 (square centimeter)

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