document.write( "Question 114633: \r
\n" ); document.write( "\n" ); document.write( " How much of an alloy that is 10% copper should be mixed with 300 ounces of an
\n" ); document.write( "alloy that is 90% copper in order to get an alloy that is 50% copper?\r
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Algebra.Com's Answer #83393 by checkley71(8403)\"\" \"About 
You can put this solution on YOUR website!
.1X+.90*300=.5(300+X)
\n" ); document.write( ".1X+270=150+.5X
\n" ); document.write( ".1X-.5X=150-270
\n" ); document.write( "-.4X=-120
\n" ); document.write( "X=-120/-.4
\n" ); document.write( "X=300 OUNCES OF 10% COPPER IS REQUIRED.
\n" ); document.write( "PROOF:
\n" ); document.write( ".10*300+.9*300=.5*600
\n" ); document.write( "30+270=300
\n" ); document.write( "300=300
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