18. 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 work on it for 5 days, then B takes up and works for 15 days. Finally, C finishes the work in 18 days. The number of days in which C alone can do the work when doing it separately is
D. 60
Let A, B and C can do this work in x days, y days and z days, respectively. According to the question,
Discussion :: Time and Work - General Questions (Q.No.3)
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