SOLUTION: A metal alloy weighing 2 mg and containing 10% copper is melted and mixed with 1 mg of pure copper. What percent of the resulting alloy is copper?

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Question 715484: A metal alloy weighing 2 mg and containing 10% copper is melted and mixed with 1 mg of pure copper. What percent of the resulting alloy is copper?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Total copper = %280.10%2A1+%2B+1%29mg.
Total new alloy = 2 mg.

Fraction of new alloy as copper =%280.10%2A1%2B1%29%2F2