If the height of a cuboid is reduced by 3 cm, it will become a cube, and the surface area will be reduced by 60 square cm

The reduced surface area is 4 rectangles with the length of the original cuboid ground as the length and 3 as the width, then 60 △ 4 △ 3 = 5cm,
It can be seen from the title that the bottom and width of the original cuboid are 5 cm, so the surface area is 5 * 5 * 2 + 5 * 8 * 4 = 210 square cm

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