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     EduGorilla 
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    A and B can complete a work in 10 and 15 days respectively. They started working together but their efficiency was less than their normal efficiency and after 5 days of starting they found that they have done only 70% of the work so to complete the work on time by how much percentage they should increase their normal efficiency?

    Options :-

    1. 60
    2. 70
    3. 80
    4. 65
    5. 50
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