document.write( "Question 202906: If the price of copper is 65 cents/lb and the price of zinc is 30 cents/lb, how many pounds of copper and zinc should be mixed to make 70lb of brass selling for 45 cents per pound? \n" ); document.write( "

Algebra.Com's Answer #153150 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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If the price of copper is 65 cents/lb and the price of zinc is 30 cents/lb,
\n" ); document.write( " how many pounds of copper and zinc should be mixed to make 70 lb of brass
\n" ); document.write( " selling for 45 cents per pound?
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\n" ); document.write( "Let x = amt of copper required
\n" ); document.write( "then
\n" ); document.write( "(70-x) = amt zinc required
\n" ); document.write( ":
\n" ); document.write( "65x + 30(70-x) = 45(70)
\n" ); document.write( ":
\n" ); document.write( "65x + 2100 - 30x = 3150
\n" ); document.write( ":
\n" ); document.write( "65x - 30x = 3150 - 2100
\n" ); document.write( ":
\n" ); document.write( "35x = 1050
\n" ); document.write( "x = $\"1050%2F35\"$
\n" ); document.write( "x = 30 lb of copper
\n" ); document.write( " and
\n" ); document.write( "70 - 30 = 40 lb of zinc
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\n" ); document.write( "Check solution in original equation
\n" ); document.write( "65(30) + 30(40) = 45(70)
\n" ); document.write( "1950 + 1200 = 3150 \n" ); document.write( "

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