SOLUTION: 60 kg of an alloy of zinc and aluminium contains 80% of zinc. How much zinc must be melted into it to make the alloy contains 85% of zinc?

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Question 890144: 60 kg of an alloy of zinc and aluminium contains 80% of zinc. How much zinc must be melted into it to make the alloy contains 85% of zinc?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.8*60+z=.85(z+60)
48+z=.85z+51
.15z=3
z=20