Question 186415
a merchant has coffee worth $20 a pound that she wishes to mix with 80 pounds of coffee worth $90 a pound to get a mixture that can be sold for $60 a pound. how many pounds of the $20 coffee should be used?
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Equation:
value + value = value
20x + 90*80 = 60(x+80)
20x = 90*80 = 60x + 60*80
-40x = -30*80
x = 30*2
x = 60 lbs (amt. of $20 coffee needed in the mixtue
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Cheers,
Stan H.