Question

Person A is 40% more efficient than person B, while person C is 40% less efficient than person
B. All three—A, B, and C—can together finish a task in 35 days. If only A and B work on the task for the first 40 days, how many additional days will C alone need to complete the remaining work?

A 12.5 days
B 15 days
C 17.5 days
D 25 days
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