When both copying machines A and B are working, secretaries can make 91 copies in one minute. In one minute's time, copiers A and C together produce 85 copies, and all three working together produce 127 copies. How many copies per minute can each machine produce separately?
?
Select the correct answer. (a, b, c are the productivity of the A, B, and C machines).
?

A. machine A 49 copies, machine B 42 copies, machine C 36 copies
B. machine A 49 copies, machine B 42 copies, machine C 31 copies
C. machine A 44 copies, machine B 47 copies, machine C 36 copies
D. machine A 49 copies, machine B 47 copies, machine C 31 copies
E. machine A 44 copies, machine B 42 copies, machine C 41 copies


Answer: A

Mathematics

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