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QUESTION
A merchant has coffee worth $30 a pound that she wishes to mix with 20 pounds of coffee worth $70 a pound to get a mixture that can be sold for $40 a...
A merchant has coffee worth $30 a pound that she wishes to mix with 20 pounds of coffee worth $70 a pound to get a mixture that can be sold for $40 a pound. How many pounds of the $30 coffee should be used
