document.write( "Question 108655: A coffee merchant has coffee beans that sell for $9 per
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document.write( "pound and $12 per pound. The two types are to be mixed to create 100 lb of a mixture
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document.write( "that will sell for $11.25 per pound. How much of each type of bean should be
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document.write( "used in the mixture? \n" );
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Algebra.Com's Answer #79239 by edjones(8007) You can put this solution on YOUR website! Let n=# of lbs of $9/lb; t=# of lbs of $12/lb \n" ); document.write( ". \n" ); document.write( "A) n+t=100 \n" ); document.write( "B) 9n+12t=1125 \n" ); document.write( ". \n" ); document.write( "A) n=100-t \n" ); document.write( "B) 9(100-t)+12t=1125 \n" ); document.write( "900-9t+12t=1125 \n" ); document.write( "3t+900=1125 \n" ); document.write( "3t+900-900=1125-900 \n" ); document.write( "3t=225 \n" ); document.write( "t=75 lbs \n" ); document.write( "n=25 lbs \n" ); document.write( "Always check: \n" ); document.write( "9*25+12*75=1125 true \n" ); document.write( ". \n" ); document.write( "Ed \n" ); document.write( " |