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Q 1473312246.     A and B together can complete a task in 7 days. B alone can do it in 20 days. What part of the work was carried out by A?
I. A completed the job alone after A and B worked together for 5 days.
II. Part of the work done by A could have been done by B and C together in 6 days.
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)