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A metal strip having sides 17 x 7 x 5 cm is melted down and minted into coins each of diameter 1.4cm and thickness 0.08 cm. Assuming no wastage, how many coins can be minted?
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Solution:

Metal strip has dimensions 17 x 7 x 5 cm

Volumeofmetalstrip=17x7x5=595cm3

Coinhasdiameter1.4cmradius=0.7cm

Volumeofonecoin=πr2h

=π(0.7)2(0.08)

=0.123

Numberofcoinmethod=VolumeofmetalstripVolumeofonecoin

=5950.123

=4837.4

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