A wheel that has 2 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:  Choices:
A) 49
B) 4
C) 12
D) 3
E) 27
Let the required number of revolutions made by larger wheel be x.   Then, More cogs, Less revolutions (Indirect Proportion)   14 : 2 :: 21 : x 14 * x = 2 x 21   x =	(2 x 21)/14   x = 3.   Answer is 3.
<result>D</result>
A wheel that has 2 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: