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    Question

    In an office, an employee plans to do a work in 16days

    with 3 laptops. But after 9 days, he found that only 30% of the work is done with the laptops working for 4 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 12 hours Correct Answer Incorrect Answer
    B 8 hours Correct Answer Incorrect Answer
    C 9 hours Correct Answer Incorrect Answer
    D 15 hours Correct Answer Incorrect Answer
    E 10 hours Correct Answer Incorrect Answer

    Solution

    Laptops  do 30% of the work in 9 days, or 9 × 4 = 36 hours. So the rest of the (i.e., 70% of the work) can be done in, => (70 × 36)/30 = 84 hours This 84 hours of work has to be done in the remaining (16 – 9) = 7 days. Laptops  have to work (84/7) = 12 hours a day to complete the work in the planned time.

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