An open rectangular box is made of wood 2cm thick. If the internal dimensions of the box are 50cm long, 36cm wide and 20cm deep, the box volume of wood in the box is

  • A 11 520cm3
  • B 36 000cm3
  • C 38 200cm3
  • D 47 520cm3
jamb 1994mathematics

The correct answer is A. 11 520cm3

Internal dimension are 50cm, 36cm and 20cm

internal volume = 50 x 36 x 20cm

1000 x 36cm

= 36000cm

External dimension are 54cm x 40cm x 22cm

= 2160cm

x 22cm = 47520cm

Volume of wood = Ext. volume - Int. volume

= 47,520cm

- 36,000cm

= 11,520cm

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