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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 made by the larger wheel is ?
A.
11
B.
7
C.
9
D.
13
View Answer
Correct choice: C
Explanation:
Here the number of cogs is inveresly proportional to number of revolutions => More cogs less revolution => 6 : 14 :: x : 21 => (21x6)/14 = 9
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