ten gram gold and silver

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fruti_yum: Master | Next Rank: 500 Posts; Posts: 128; Joined: Thu Jul 30, 2009 1:46 pm; Thanked: 1 times

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: Beat The GMAT — Problem Solving | Sun Sep 13, 2009 1:00 pm

FinanceBioE: Newbie | Next Rank: 10 Posts; Posts: 6; Joined: Sun Sep 13, 2009 12:31 pm

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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