Problema Solution
a merchant has coffee worth $20 a pound that she wishes to mix with 60 pounds of coffee worth $90 dollars a pound to get a mixture that can be sold for $60 dollars a pound. How many pounds of the $20 coffee should be used?
Answer provided by our tutors
let x = lbs of the $20 coffee used
20x + 90*60 = 60(x + 60)
by solving we find
x = 45 lb of the $20 a pound coffee
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45 lb of the $20 a pound coffee should be used.