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     EduGorilla 
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    A and B can do a piece of work in 16 days and 20 days respectively. They begin together but 4 days before the completion of the work, A leaves. The total number of days to complete the work is

    Options :-

    1. 9 2/7
    2. 10 1/9
    3. 11 1/9
    4. 13 1/5
    5. 12
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