Question

12. A can do a piece of work in 20 days, b in 30 days and c in 60 days. All of them began to work together. However a left the job after 6 days and b quit work 6 days before the completion of work. How many days did the work last? A. 20 days b. 15 days c. 25 days d. 30 day

Answer 1

30 days will be right answer

Answer 2

*c. 25 days

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