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    Question

    In an office, an employee plans to do a work in 20 days

    with 6 laptops. But after 10 days, he found that only 40% of the work is done with the laptops working for 6 hours a day. If he want to complete the work in the planned time with the laptops, how many hours per day the laptops have to work?
    A 6 hours Correct Answer Incorrect Answer
    B 12 hours Correct Answer Incorrect Answer
    C 9 hours Correct Answer Incorrect Answer
    D 10 hours Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Laptops do 40% of the work in 10 days, or 10 × 6 = 60 hours. So the rest of the (i.e., 60% of the work) can be done in, => (60 × 60)/40 = 90 hours This 90 hours of work has to be done in the remaining (20 – 10) = 10 days. Laptops have to work (90/10) = 9 hours a day to complete the work in the planned time.

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