X, Y and Z can do a piece of work in 24 days, 30 days and 40 days respectively. They began the work together but Z left 4 days before the completion of the work. In how many days was the work completed?

Ques:- X, Y and Z can do a piece of work in 24 days, 30 days and 40 days respectively. They began the work together but Z left 4 days before the completion of the work. In how many days was the work completed?

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