Solve the problem.A merchant has coffee worth $40 a pound that she wishes to mix with 30 pounds of coffee worth $90 a pound to get a mixture that can be sold for $70 a pound. How many pounds of the $40 coffee should be used?
A. 10 lb
B. 50 lb
C. 20 lb
D. 25 lb
Answer: C
Mathematics
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A. 
B. 
C. 
D. 
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