SOLUTION: A merchant has coffee worth $20 a pound that she wishes to mix with 90 pounds of coffee worth $90a pound to get a mixture that can be sold for $50 a pound. How many pounds of the $
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Question 311206: A merchant has coffee worth $20 a pound that she wishes to mix with 90 pounds of coffee worth $90a pound to get a mixture that can be sold for $50 a pound. How many pounds of the $20 coffee should be used?
