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Discussion :: Chain Rule

  1. If 15 men can reap the crops of a field in 28 days, in how many days will 5 men reap it?

    2. A.
    50 days
    B.
    60 days
    C.
    84 days
    D.
    9.333 days

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    Answer : Option C

    Explanation :

    Let 5 men can reap a field in x days
    So, put the same quantities on the same side.
    Men: Days
    Now, Men and Days are inversely proportional to each other. If we increase the number of men fewer days will be required to complete the work.
    Inversely proportional means

    i.e., 5: 15 = 28: x
    Or, x = (28*15)/ 5
    Or, x = 84 days
    Hence, 5 men can reap a field in 84 days.

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