document.write( "Question 964882: A light brew coffee sells for $12 per pound is to be mixed with a dark brew coffee that sells for $9 per pound to get a 5-pound mixture that will sell for $10 per pound. How many pounds of light brew and dark brew coffee should be used? \n" ); document.write( "
Algebra.Com's Answer #589687 by macston(5194)\"\" \"About 
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\n" ); document.write( "T=amount of $12 coffee; N=amount of $9 coffee.
\n" ); document.write( "N+T=5lbs
\n" ); document.write( "N=5lbs-T Use this to substitute for N
\n" ); document.write( "$9N+$12T=$10(5lbs) Substitute for N from above.
\n" ); document.write( "$9(5lbs-T)+$12T=$50lbs
\n" ); document.write( "$45lbs-$9T+$12T=$50lbs Subtract $45lbs from each side.
\n" ); document.write( "$3T=$5lbs Divide each side by $3.
\n" ); document.write( "T=5/3 lbs ANSWER 1:5/3 lbs of light brew ($12) coffee should be used.
\n" ); document.write( "N=5lbs-T=5lbs-5/3lbs=10/3 lbs ANSWER 10/3 lbs of dark brew ($9) should be used.
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\n" ); document.write( "CHECK:
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\n" ); document.write( "$9N+$12T=$10(5lbs)
\n" ); document.write( "$9(10/3)+$12(5/3)=$10(5lbs)
\n" ); document.write( "$90/3+$60/3=$50
\n" ); document.write( "$30+$20=$50
\n" ); document.write( "$50=$50\r
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