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A wooden box measures 20 cm by 12 cm by 10 cm. Thickness of wood is 1 cm. Volume of wood to make the box (in cubic cm) is
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- 960
- 519
- 2400
- 1120
- 960
Correct Option: A
The external dimensions of the box are : Length = 20 cm,
Breadth = 12cm,
Height = 10 cm
External volume of the box = 20 × 12 × 10 = 2400 cm³.
Thickness of the wood = 1 cm Internal length = 20 – 2 = 18 cm
∴ Internal breadth = 12 – 2 = 10 cm
Internal height = 10 – 2 = 8 cm
Internal volume = 18 × 10 × 8 = 1440 cm³.
Volume of the wood = (2400 – 1440) cm³ = 960 cm³.
