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A, B and C can complete a work in 10, 12 and 15 days respectively. If A, B and C starts the work together but after 3 days A left the work and C left the work 4 days before the completion of work

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A, B and C can complete a work in 10, 12 and 15 days respectively. If A, B and C starts the work together but after 3 days A left the work and C left the work 4 days before the completion of work. In how many days the whole work be completed?

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Solution of question A, B, C can complete

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