document.write( "Question 473852: a merchant has coffee worth $50 a pound that she wants to mix with 90 pounds of coffee worth $80 a pound to get a mixture that can be sold for $70 a pound. How many pounds of the $50 coffee should be used? \n" ); document.write( "
Algebra.Com's Answer #324999 by stanbon(75887)\"\" \"About 
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a merchant has coffee worth $50 a pound that she wants to mix with 90 pounds of coffee worth $80 a pound to get a mixture that can be sold for $70 a pound. How many pounds of the $50 coffee should be used?Equation:
\n" ); document.write( "value + value = value
\n" ); document.write( "50x + 80*90 = 70(x+90)
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\n" ); document.write( "50x + 80*90 = 70x + 70*90
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\n" ); document.write( "20x = 10*90
\n" ); document.write( "x = 45 lbs (amt. of $50 coffee needed)
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\n" ); document.write( "Cheers,
\n" ); document.write( "stan H.
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