Lessons

General Aptitude
13.1 Chain Rule - General Questions

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Q.

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:

View Answer

Correct choice: 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 = 6 x 21
14

x = 9.

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