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** Q 2454380254. ** Three pipes X, Y and Z are filling a tank, the number of days required by X, Y and Z to fill a tank individually is 6, 12 and 4 respectively. If all pipes start filling the tank alternatively i.e. if X fills on 1st day then Y on 2nd day and so on. How many days are needed to completely fill the tank?

**IBPS-CLERK 2017 Mains **