SOLUTION: How many grams of an alloy that is 70% silver should be melted with 60 grams of an alloy that is 20% silver to produce an alloy that is 30% silver?

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Question 339646: How many grams of an alloy that is 70% silver should be melted with 60 grams of an alloy that is 20% silver to produce an alloy that is 30% silver?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
.70X+.20*60=.30(60+X)
.70X+12=18-.30X
.70X-.30X=18-12
.40X=6
X=6/.4
X=15 OZ. OF 70% SILVER IS USED.
PROOF:
.70*15+.20*60=.30(60+15)
10.5+12=.30*75
22.5=22.5