Aptitude - Chain Rule - Discussion
Discussion Forum : Chain Rule - General Questions (Q.No. 9)
9.
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:
Answer: Option
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.
Discussion:
13 comments Page 2 of 2.
Vinay vishwakarma said:
7 years ago
Which formula use for this question? please explain anyone.
(1)
Niki said:
5 years ago
Solution:
Each revolution of 2nd takes 14/6 =2 with rem2.
By common sense for 21/6 = 3.
Each time we need to add 2 so 3*2 = 6.
Adding both gives 6+3 = 9.
Each revolution of 2nd takes 14/6 =2 with rem2.
By common sense for 21/6 = 3.
Each time we need to add 2 so 3*2 = 6.
Adding both gives 6+3 = 9.
(1)
Md.Nazmul Hoque said:
5 years ago
6 cog with 21 revolution cover 6 * 21=126 unit.
14 cog with 9 revolution cover14 * 9=126 unit.
14 cog with 9 revolution cover14 * 9=126 unit.
(2)
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