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Q 1413212140.     A and B can do a piece of work in 30 days, while B and C can do the same work in 24 days and C and A in 20 days. They all work together for 10 days when B and C leave. How many days more will A take to finish the work?
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)