Find the volume of a rectangular parallelepiped if its length is 21 cm, and its width is 3/7 of the length and 30% of the height.
Let’s find the width of the parallelepiped. It is 3/7 of the length, and the length is 21 cm.
x = 21 cm * 3/7.
x = 9 cm. Width is 9 cm.
The width is known to be 30% of the height. Let’s find the height.
y = 9 cm ÷ 30% * 100%.
y = 30 cm. The height is 30 cm.
Let’s find the volume of a rectangular parallelepiped.
21 cm * 9 cm * 30 cm = 5670 cm³.
Answer: 5670 cm³.
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