Translate the problem to a system of equations, then solve using matrices.A merchant has coffee worth $30 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that can be sold for $40 a pound. How many pounds of the $30 coffee should be used?

A. 250 lb
B. 300 lb
C. 125 lb
D. 150 lb


Answer: A

Mathematics

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A.
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