A,B and C can do a piece of work in 10,12 and 15 days respectively. A leaves 5 days before the completion of the work and B leaves 2 days after A. The whole work lasts for ?->(Show Answer!)

1. A,B and C can do a piece of work in 10,12 and 15 days respectively. A leaves 5 days before the completion of the work and B leaves 2 days after A. The whole work lasts for

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