The length, width and height of a cuboid wood block are 5cm, 4cm and 3cm respectively. If it is used to form the largest cube, the volume will be reduced by percent 3*4*5=60 3*3*3=27 60-27 / 60 = 55%, right? Why 3 * 4 * 5? Why 3 * 3 * 3?

The length, width and height of a cuboid wood block are 5cm, 4cm and 3cm respectively. If it is used to form the largest cube, the volume will be reduced by percent 3*4*5=60 3*3*3=27 60-27 / 60 = 55%, right? Why 3 * 4 * 5? Why 3 * 3 * 3?

Yes. 3 * 4 * 5 is the volume of the original cuboid, and 3 * 3 * 3 is the volume of the largest cube

The length, width and height of a cuboid are 5cm, 4cm and 3cm respectively. If it is used to saw the largest cuboid, how much smaller is the volume?

Now the volume is 5 × 4 × 3 = 60 cubic centimeter;
The maximum cube volume is 3 × 3 × 3 = 27 cubic centimeter;
Decrease = (60-27) △ 60 × 100% = 55%
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Each classroom is 10 meters long, 8 meters wide and 3 meters high. Now we have to paint it. The four walls and the blackboard of the ceiling, doors and windows are deducted by 24 square centimeters. What is the painting area of the classroom

2*8*3+2*10*3+10*8-0.0024=187.9976
This is the area without painting the floor

A 9-meter-long, 6-meter-wide and 4-meter-high classroom has 15 square meters of doors and windows. If you want to paint the ceiling and four walls, how much is the painting area?

9 × 6 + 2 × (9 × 4 + 4 × 6) - 15 = 159 (M2)