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
Correct Answer: A
Explanation
Internal dimension are 50cm, 36cm and 20cm internal volume = 50 x 36 x 20cm3 1000 x 36cm3 = 36000cm3 External dimension are 54cm x 40cm x 22cm = 2160cm2 x 22cm = 47520cm3 Volume of wood = Ext. volume - Int. volume = 47,520cm3 - 36,000cm3 = 11,520cm3