document.write( "Question 996494: A silver dollar, an alloy of silver and copper, is 7.5% copper by weight. How many grams of pure copper should be used to prepare a 200 grams of a copper-silver alloy that is 10% copper by weight? \n" ); document.write( "
Algebra.Com's Answer #614970 by josgarithmetic(39617)\"\" \"About 
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x, how many grams pure 100% copper?\r
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\n" ); document.write( "\n" ); document.write( "200-x, amount of the 7.5% alloy.\r
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\n" ); document.write( "\n" ); document.write( "\"%28%28200-x%29%2A7.5%2B100x%29%2F200=10\"\r
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\n" ); document.write( "\n" ); document.write( "two-part mixture, percents, just one variable - video example
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