Q7 of 14 Page 309

A closed box is made up of wood which is 1cm thick. The outer dimensions of the box is 5 cm × 4 cm × 7 cm. Find the volume of the wood used.

Measurement of box from outside:

Length = 5 cm Breadth = 4 cm and Height = 7 cm


Volume of cuboid = Length × Breadth × Height


= 5 cm × 4 cm × 7 cm


= 140 cm3


Measurement of box from outside


Length = 4 cm Breadth = 3 cm and Height = 6 cm


Volume of cuboid = Length × Breadth × Height


= 4 cm × 3 cm × 6 cm


= 72 cm3


Volume of wood used = volume of the box from outside – volume of the box from inside


= 140 – 72


= 68 cm3


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