120kg of an alloy of zinc and copper contains 60% zinc. How much zinc must be melted into it so that the alloy contains 70% zinc?
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Answered by
18
(60/100)×120
=72
(70/100)×120
=84
84-72=12 kg
=72
(70/100)×120
=84
84-72=12 kg
Answered by
26
60kg of an alloy of copper and zin contains 60%copper how much copper must be added in to it make an alloy containing 80%copper?
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