question_answer

A and B together can do a piece of work in 30 days, B and C together can do it in 20 days. A starts the work and works on it for 5 days, then B works for 15 days. Finally C finishes the work in 18 days. In how many days can C alone do the work?

A)  40 days                       

B)  24 days

C)  120 days                     

D)  60 days

E)  None of these