SOLUTION: A parts manufacturer has 40 kg of a copper and zinc alloy which contains 8 kg of zinc. Find the amount of copper which must be added if the manufacturer requires a new alloy contai

Question 974628: A parts manufacturer has 40 kg of a copper and zinc alloy which contains 8 kg of zinc. Find the amount of copper which must be added if the manufacturer requires a new alloy containing 10% zinc.
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Copper will dilute the Zinc.

NOTE: This seemed a little easier converting fully into regular fractions than percents or mixing percents with regular fractions. Usually the choice is yours when you solve, depending on instructions.
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