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The length, width and height of a cuboid are 20m, 15m and 10m respectively. If the height is increased by 5m, the cuboid volume will be increased by () cubic meters The surface area increased by () square meters
To increase the height by 5m is to add a cuboid of 20m, 15m and 5m in length, width and height,
So the volume is increased: 20 * 15 * 5 = 1500 cubic meters
After the change, the area of the top and bottom of the cuboid remains unchanged, only the area of the four sides changes, so the surface area increases
(20 * 5 + 15 * 5) * 2 = 350 square meters
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