document.write( "Question 567606: A merchant has coffee worth $4 a pound that she wishes to mix with 80 pounds of coffee worth $9 a pound to get a mixture that can be sold for $5 a pound. How many pounds of the $4 coffee should be used?\r
\n" ); document.write( "\n" ); document.write( "My answer = 320 lbs\r
\n" ); document.write( "\n" ); document.write( "Thanks for your help.
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Algebra.Com's Answer #366630 by nerdybill(7384)\"\" \"About 
You can put this solution on YOUR website!
A merchant has coffee worth $4 a pound that she wishes to mix with 80 pounds of coffee worth $9 a pound to get a mixture that can be sold for $5 a pound. How many pounds of the $4 coffee should be used?
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\n" ); document.write( "You would be correct!
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\n" ); document.write( "Let x = amount (pounds) of $4 coffee
\n" ); document.write( "then
\n" ); document.write( "4x + 9(80) = 5(x+80)
\n" ); document.write( "4x + 720 = 5x+400
\n" ); document.write( "720 = x+400
\n" ); document.write( "320 pounds = x
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