Solve the problem.A merchant has coffee worth $20 a pound that she wishes to mix with 60 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?
A. 52.5 lb
B. 22.5 lb
C. 45 lb
D. 105 lb
Answer: C
Mathematics
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