If the length of a rectangle is reduced by 5 cm, the area of the rectangle will be reduced by 40 square cm, and the rest is just a square, which is the same as the original rectangle

If the length of a rectangle is reduced by 5 cm, the area of the rectangle will be reduced by 40 square cm, and the rest is just a square, which is the same as the original rectangle

The width of the original cuboid is 40 △ 5 = 8 cm
Length = 8 + 5 = 13 cm
The area of the original rectangle = 13 × 8 = 104 square centimeters
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