Here you are not adding the A's efficiency while dividing the total work cz A left 2 days after. But in the earlier part, u have added total efficiency while dividing the total work, added those efficiency also, who left before 4 days. Can you please explain? Is there any reason of before and after in this particular case ?
Q.10 answer is little bits may be mistake .A after left 3 days and C left before 2days then remaining word done by B . So ,I Thinking it's could be something wrong
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