Multiple Choice Questions on 27 people can repair a building in 15 days working 4 hours a day In how many days will 20 people wor........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

27 people can repair a building in 15 days working 4 hours a day In how many days will 20 people wor...........

Quant (SSC) Time and work
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    27 people can repair a building in 15 days, working 4 hours a day. In how many days will 20 people, working 9 hours a day, complete the work?

    10 days

    Incorrect Answer

    9 days

    Correct Answer

    14 days

    Incorrect Answer

    12 days

    Incorrect Answer
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    Explanation:

    Let the required number of days be z. Then,
    Less people, More days                                        (Indirect proportion)
    More working hours per day, Less days                  (Indirect proportion)
    People 20 : 27
                         :: 15 : z
    Hours 9 : 4
    z  = 27 x 4 x 15 /20 x 9 = 9days

    By: Amit Kumar
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