document.write( "Question 442274: Extremely confused daughter tried to help and she is stumped this is from an algebra practice test word problem is: \r
\n" ); document.write( "\n" ); document.write( "A merchant has coffee worth $10 a pound that she wants to mix with 40 pounds of coffee worth $80 a pound to get a mixture that can be sold at $30 a pound. How many pounds of the $10 coffee should be use. Can you explain and show how you came up with answer please. Thank you for any help you can give us.
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Algebra.Com's Answer #305077 by shree840(260)\"\" \"About 
You can put this solution on YOUR website!
let us use x pounds of coffee total cost 10x cost of 40 lbs at $80=3200\r
\n" ); document.write( "\n" ); document.write( "total pounds=40+x total cost = 30(40+x)
\n" ); document.write( "10x+3200=30(40+x)=1200+30x
\n" ); document.write( "2000=30x-10x=20x
\n" ); document.write( "100=x\r
\n" ); document.write( "\n" ); document.write( "so we mix 100lbs at $10 with 40lbs at $80
\n" ); document.write( "total cost 3200+1000=4200
\n" ); document.write( "total lbs =100+40=140
\n" ); document.write( "cost =$30 Ans
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