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ten gram gold and silver

Expert replies
by fruti_yum » Sun Sep 13, 2009 1:00 pm
A ten-gram piece of a certain alloy contains only gold and silver. If the piece currently contains exactly 3 grams of silver, how many more grams of gold must be added to the piece so that the resulting piece is 10 percent silver?

OA after some discussion!
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Source: — Problem Solving |

by FinanceBioE » Sun Sep 13, 2009 1:30 pm
Currently the piece is
10grams (3grams silver 7grams gold) thus 30% silver

.30(10) = .1(10+x)

x = 20

need to add 20 more grams of gold
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