SOLUTION: A goldsmith mixes 10oz of a 30% gold alloy with 20oz of a 15% gold alloy. what is the percent concentration of the resulting alloy?

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Question 246284: A goldsmith mixes 10oz of a 30% gold alloy with 20oz of a 15% gold alloy. what is the percent concentration of the resulting alloy?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
10*.30+20*.15=30*x
3+3=30x
6=30x
divide by 6
1=5x
.20=x
20%=x