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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:
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- 4
- 9
- 14
- 7
Correct Option: B
Suppose that required number of revolutions made by larger wheel be N.
Then, More cogs, Less revolutions (Indirect Proportion)
We can write as -
14 : 6 :: 21 : N ⇔ 14 x N = 6 x 21
| ⇒ N = | 6 x 21 |
| 14 |
⇒ N = 3 x 3 = 9 revolutions .
Hence required answer is 9 revolutions .
