Solve the problem.A merchant has coffee worth $20 a pound that she wishes to mix with 30 pounds of coffee worth $60 a pound to get a mixture that is worth $30 a pound. How many pounds (lb) of the $20 coffee should be used?
A. 120 lb
B. 60 lb
C. 45 lb
D. 90 lb
Answer: D
Mathematics
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Mathematics