When the height of a cuboid wood block is reduced by 3 cm, it becomes a cube, and the surface area is reduced by 120 square cm. What is the original surface area of the cuboid

When the height of a cuboid wood block is reduced by 3 cm, it becomes a cube, and the surface area is reduced by 120 square cm. What is the original surface area of the cuboid

When the height is reduced by 3 cm, it becomes a cube, and the surface area is reduced by 120 square cm
The reduced area is the side area 3 cm high, so the perimeter of the bottom surface is 120 / 3 = 40
The side length of the square is 40 / 4 = 10
The original cuboid has a bottom of 10 * 10 and a height of 13
The surface area is 10 * 10 * 2 + 40 * 13 = 720 square centimeters

Use seven cubes of the same size to make a cuboid. How many times is the surface area of the cuboid?

1×7×4+1×1×2=30
30÷（1×1×6）=5
5 times

Put three cubes with a surface area of 6 square meters together into a cuboid. What's the surface area of the cuboid? How to do it

The area of each face of a cube is 6 / 6 = 1
3 pieces make 2 pieces, reduce 4 pieces
What's the surface area
6*3-1*4=18-4=14