20 how much metal is needed to smelt a cubical metal box with outer side 12 inches long if the thickness of its walls should be exactly 3 inches?
1 answer:
The volume of the metal box if the box was completely solid (V1), is: V1=(12 inches)³ V1=1728 inches³ As there are 3 inches of metal on both sides, the widht if the metal box was not completely solid, is: W=12 inches-(3 inchesx2) W=6 inches Then, the volumen of the no solid metal box is: V2=(6 inches)³ V2= 216 inches³ Therefore, the volume of metal needed to smelt the cubical metal box, is: V3=V1-V2 V3=1728 inches³-216 inches³ V3=1512 inches ³
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