Question

Two efficient workers or three non-efficient workers can complete a certain task in 20 days. If each efficient worker improves their efficiency by 33(1/3)% and each non-efficient worker reduces their efficiency by 50%, how long will it take for a team of two efficient workers and two non-efficient workers, under these new conditions, to finish the same task?

A 8 days
B 18 days
C 15 days
D 10 days
E None of these
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