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Discussion :: Chain Rule

  1. A wheel that has 6 cogs is meshed with a larger wheel of 14 cogs. When the smaller wheel has made 21 revolutions, then the number of revolutions mad by the larger wheel is:

    2. A.

    4
    B.

    9
    C.

    12
    D.

    49

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    Answer : Option B

    Explanation :

    Let the required number of revolutions made by larger wheel be x.

    Then, More cogs, Less revolutions (Indirect Proportion)

     14 : 6 :: 21 : x        14 x x = 6 x 21

     

     x =\(\frac {6*21 } { 14 } \)

     x = 9.

     

     

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