1.

The outer dimensions of a closed box are 42 cm, 30 cm and 20 cm. If the box is made up of wood of thickness 1 cm, determine the volume of wood used.1). 5040 cm32). 5070 cm33). 4020 cm34). 5645 cm3

Answer»

⇒ Outside VOLUME of the box = 42 x 30 x 20 cm3

⇒ Outside volume of the box = 25200 cm3

Since the thickness is 1 cm, the dimensions of inner CUBOID are 2 less than the dimensions of Outer cuboid

⇒ Inner volume of the box = 40 x 28 x 18 cm3

⇒ Inner volume of the box = 20160 cm3

⇒ Volume of wood = 25200 – 20160 cm3

∴ Volume of wood used is 5040 cm3


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