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Discussion :: Chain Rule

  1. If 7 spiders make 7 webs in 7 days, then 1 spider will make 1 web in how many days?

    2. A.

    1
    B.

    \(\frac { 7 } { 2 } \)
    C.

    7
    D.

    49

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    Answer : Option C

    Explanation :

    Let the required number days be x.

    Less spiders, More days (Indirect Proportion)

    Less webs, Less days (Direct Proportion)

     

    Spiders 1 : 7 :: 7 : x
    Webs 7 : 1

     1 x 7 x x = 7 x 1 x 7

     x = 7.

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