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July 6, 2015

Homework Help: Math Concentration

Posted by missy on Sunday, June 26, 2011 at 10:21pm.

Joe has a ring weighing 10 grams made of an alloy of 13% silver and the rest gold. He decides to melt down the rings and add enough silver to reduce the gold content to 69%. How many grams of silver should he add?

My set up is:

10 (.13 + .87) = 10 (.13 + X + .69)

I'm not sure if that's correct.

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