SOLUTION: Metal Alloys. In order for a metal to be labeled "sterling silver," the silver alloy must contain at least 92.5% pur silver. Nicole has 32oz of coin silver, which is 90% pure silve

Question 352168: Metal Alloys. In order for a metal to be labeled "sterling silver," the silver alloy must contain at least 92.5% pur silver. Nicole has 32oz of coin silver, which is 90% pure silver. How much pure silver must she add to the coin silver in order to have a sterling silver alloy?
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
.9*32+X=.925(X+32)
28.8+X=.925X+29.6
X-.925X=29.6-28.8
.075X=.8
X=.8/.075
X=10.67 OZ OF PURE SILVER IS REQUIRED.
PROOF:
.9*32+10.67=.925(10.67+32)
28.8+10.67=.925*42.67
39.47=39.47
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