document.write( "Question 1007013: A metal worker has a metal alloy that is 30% copper and another alloy that is 70% copper how many kilograms of each Alloway should the metalwork are combined to create 90 KG of a 62% copper alloy \n" ); document.write( "
Algebra.Com's Answer #623046 by josgarithmetic(39618)\"\" \"About 
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\"system%28%2830x%2B70y%29%2F90=62%2Cx%2By=90%29\"\r
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\n" ); document.write( "\n" ); document.write( "simpler,
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\n" ); document.write( "Not tricky. Linear system.\r
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\n" ); document.write( "\n" ); document.write( "You could also choose to do in just one single variable as demonstrated here:
\n" ); document.write( "just one variable to solve two-part percent mixture
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