document.write( "Question 993666: The store manager decides to make 40lbs of blend of coffees that he plans to sell for 10 dollars a lb. He mixes some coffee that sells for 9 dollars a lb with coffee that sells for 12 dollars a lb. How much of each should he use? (Hint- one coffee is x and the other coffee of the rest of the mixture so use 40 - x for the amount)\r
\n" ); document.write( "\n" ); document.write( "I already calculated that 40 lbs of coffee costing 10 dollars a lb would be 400 dollars. Now I need help on how to calculate how many pounds adding up to 40lbs. I would use of each that would bring me to 400 dollars total.
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Algebra.Com's Answer #612944 by MathTherapy(10552) $\"\"$ $\"About$

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The store manager decides to make 40lbs of blend of coffees that he plans to sell for 10 dollars a lb. He mixes some coffee that sells for 9 dollars a lb with coffee that sells for 12 dollars a lb. How much of each should he use? (Hint- one coffee is x and the other coffee of the rest of the mixture so use 40 - x for the amount)\r
\n" ); document.write( "\n" ); document.write( "I already calculated that 40 lbs of coffee costing 10 dollars a lb would be 400 dollars. Now I need help on how to calculate how many pounds adding up to 40lbs. I would use of each that would bring me to 400 dollars total.
\n" ); document.write( "Thank you!
\n" ); document.write( "

Since you wish to use x for the amount of one of the blends, then we'll make the amount of the $9/lb-blend to mix, be x
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document.write( "Then amount of the $12/lb-blend to mix is: 40 - x
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document.write( "We then get the following equation: 
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document.write( "9x + 12(40 - x) = 40(10)
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document.write( " 9x + 480 - 12x = 400
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document.write( "           - 3x = 400 - 480
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document.write( "           - 3x = - 80
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document.write( "x, or amount of $9/lb-blend to mix = , or  lbs
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document.write( "Amount of $12/lb-blend to mix: , or  lbs \n" );
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