Q10 of 45 Page 11

An open rectangular cistern when measured outside is 1.35 m long 1.08m broad and 90cm deep and is made of iron which is 2.5cm thick. Find the capacity of the cistern and the volume of the iron used.

The external dimensions of the cistern are Length = 135 cm, breadth = 108cm, depth = 90 cm.External volume = The internal dimensions of the cistern areLength = (135 - 5) cm = 130 cm, breadth = (108 - 5) cm = 103cmHeight = (90 - 2.5) cm = 87.5 cmThe capacity of the cistern = internal volume of the cisternVolume of iron = external volume - internal volume

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