An artisan has 63Kg of metal of density 7000Kg/m^{3}. He intends to use it to make a rectangular pipe with external dimension 12 cm by 15 cm and internal dimension 10 cm by 12 cm. calculate the length of the pipe in metres.

Density=m/vVolume=m/d = ^{63}/_{7000}=0.009m^{3}=9000cm^{3}Volume = l x w x h= 12x15=180cm^{2} 10x12=120cm^{2}180cm^{2}-120cm^{2}=60cm^{2}9000/60=150cm=1.5m

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