A wheel that has 14cogs is meshed with a larger wheel of 28cogs. When the smaller wheel has made 20evolutions, then the number of revolutions mad by the larger wheel is: Select.
A) 20
B) 11
C) 12
D) 10
E) 15
D   10   Let the required number of revolutions made by larger wheel be x.   Then, More cogs, Less revolutions (Indirect Proportion)   28 : 14 :: 20 : x &lt;-&gt; 28 x x = 14 x 20   x = (14 x 20)/28   x =10
<result>D</result>
A wheel that has 14cogs is meshed with a larger wheel of 28cogs. When the smaller wheel has made 20evolutions, then the number of revolutions mad by the larger wheel is: