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 ?
Correct Answer: 9
Explanation:
Here the number of cogs is inveresly proportional to number of revolutions
=> More cogs less revolution
=> 6 : 14 :: x : 21
=> (21x6)/14 = 9
