document.write( "Question 108655: A coffee merchant has coffee beans that sell for $9 per
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\n" ); document.write( "that will sell for $11.25 per pound. How much of each type of bean should be
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Algebra.Com's Answer #79239 by edjones(8007)\"\" \"About 
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Let n=# of lbs of $9/lb; t=# of lbs of $12/lb
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\n" ); document.write( "A) n+t=100
\n" ); document.write( "B) 9n+12t=1125
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\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
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