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Question
How many cubic centimeters of iron are there in an open box whose external dimensions are 36 cm, 25 cm and I 6.5 cm, the iron being 1.5 cm thick throughout? If I cubic cm of iron weighs 15g, find the weight of the empty box in kg.
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Solution
`"Outer dimensions"`
`l=36 m`
`b=25cm`
`h=16.5cm`
Inner dimensions
`l=36-(2xx1.5)=33cm`
`b=25-(3)=22cm`
`h=16.5-1.5=15cm`
Volume of iron = outer volume – inner volume
`=(36xx25xx16.5-33xx12xx15)cm^2=3960cm^3`
Weight of iron =`3960xx1.5gm=59400gm=59.4kg`
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