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Discussion :: Chain Rule

  1. 39 persons can repair a road in 12 days, working 5 hours a day. In how many days will 30 persons, working 6 hours a day, complete the work?

  2. A.

    10

    B.

    13

    C.

    14

    D.

    15

    View Answer

    Workspace

    Answer : Option B

    Explanation :

    Let the required number of days be x.

    Less persons, More days (Indirect Proportion)

    More working hours per day, Less days (Indirect Proportion)

     

    Persons 30 : 39 :: 12 : x
    Working hours/day 6 : 5

     30 x 6 x x = 39 x 5 x 12

     x \(\frac { (39*5*12) } { (30*6) }\)

     x = 13.


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