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A can do a work in 20 days and B can do it in 14 days. If they work together for 7 days, then the fraction of the work left is:

A,B and C can complete a work in 10,12 and 15 days respectively.They started the work together.But A left the work 5 days before its completion.B also left the work 2 days after A left.In how many days was the work completed? 4 b.15 c.7 d.8