Solve the problem.The manager of a coffee shop has one type of coffee that sells for $9 per pound and another type that sells for $13 per pound. The manager wishes to mix 70 pounds of the $13 coffee to get a mixture that will sell for $10 per pound. How many pounds of the $9 coffee should be used?

A. 140 lb
B. 105 lb
C. 280 lb
D. 210 lb


Answer: D

Mathematics

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