Homework Help: maths --plse help me..

Posted by Anamika on Monday, December 17, 2012 at 9:10am.

How many cubic centimeter of iron is required to construct an open box whose external dimensions are 36cm,25cm, and 16.5 cm provided the thickness of the iron is 1.5cm. If one cubic cm of iron weighs 7.5g find the weight of the box.

maths --plse help me.. - Steve, Monday, December 17, 2012 at 10:00am
outside volume: 36*25*16.5 = 14850 cm^3
inside volume: (36-3)*(25-3)*(16.5-1.5) = 10890 cm^3

metal volume: 3960 cm^3
box weight: 3960*7.5 = 29700g = 29.7kg

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