Aman, Arun and Abraham can complete a work in 12, 20 and 24 days respectively. They all start working together. Aman left the work 1 day before its completion, Arun 3 days before, Abraham 4 days before. In how many days the work is finished?
Note: Here Aman leaves the work 1 day before the completion of the work, Arun 3 days before and Abraham 4 days before. If the work of the left days of these three is added, then together they can start and finish the work. Total work = 120+10+18+120 =168 
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