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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 Made by the Larger Wheel is - Mathematics

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MCQ

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 made by the larger wheel is

Options

  • 7

  • 9

  • 14

  • 42

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Solution

9

Explanation:

Let the required number of revolutions made by larger wheel be x, Then more cogs, less revolutions 
(indirect proportion)

∴ 14 : 6 : : 21 : x

`⇒ "x" =(21xx6)/14=9`

Concept: Number System (Entrance Exam)
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