document.write( "Question 775461: Mixture Problem: A jeweler has five rings, each weighing 18g, made of an alloy of 10% silver and 90% gold. She decides to melt down the rings and add enough silver to reduce the gold content to 75%. How much silver should she add? \n" ); document.write( "
Algebra.Com's Answer #472897 by ankor@dixie-net.com(22740)\"\" \"About 
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A jeweler has five rings, each weighing 18g, made of an alloy of 10% silver and 90% gold.
\n" ); document.write( " She decides to melt down the rings and add enough silver to reduce the gold content to 75%.
\n" ); document.write( " How much silver should she add?
\n" ); document.write( ":
\n" ); document.write( "5 * 18 = 90 grams total weight
\n" ); document.write( "Let s = amt of pure silver to be added
\n" ); document.write( ":
\n" ); document.write( "Write the equation in terms of silver, results will be 25% silver (and 75% gold).
\n" ); document.write( ".10(90) + s = .25(s+90)
\n" ); document.write( "9 + s = .25s + 22.5
\n" ); document.write( "s - .25s = 22.5 - 9
\n" ); document.write( ".75s = 13.5
\n" ); document.write( "s = 13.5/.75
\n" ); document.write( "s = 18 grams of silver to be added \n" ); document.write( "
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