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A, B and C can do a piece of work in 36,...

A, B and C can do a piece of work in 36, 54 and 72 days respectively. They started the work but A left 8 days before the completion of the work while B left 12 days before the completion. The number of days for which C worked is a. `4` b. `8` c.`12` d. `24`

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