SOLUTION: a metal alloy weighing 3 mg and containing 70% copper is melted and mixed with 1 mg of a different alloy which contains 30% copper. what percent of the resulting alloy is gold?

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Question 907039: a metal alloy weighing 3 mg and containing 70% copper is melted and mixed with 1 mg of a different alloy which contains 30% copper. what percent of the resulting alloy is gold?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.7*3+.3*1=2.4 mg of copper
2.4/4=60% copper
Where is the gold?
40% something else