A box of external dimensions 48cm by 48cm by 36cm high is made of wood 1/2 cm thick. Find the volume of wood used.
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External volume= 48×48×36= 82944 cm square
Internal volume= (48-1)×(48-1)×(36-1)= 77315 cm square.
Volume of wood= 82944-77315=5629 cm square.
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