When the length of a rectangle is removed by 5cm, the area will be reduced by 40cm, and the remaining part is just a square. How many square centimeters is the area of the original rectangle

When the length of a rectangle is removed by 5cm, the area will be reduced by 40cm, and the remaining part is just a square. How many square centimeters is the area of the original rectangle

40 △ 5 = 8cm -------- the width of rectangle, the side length of square
8 + 5 = 13cm --- the length of a rectangle
8 × 13 = 104 square centimeter ------ area