A wheel that has 5 cogs is meshed with a larger wheel of 15 cogs. When the smaller wheel has made 27 revolutions, then the number of revolution made by the larger wheel is?

• Let the required number of revolutions made by larger wheel be x.
  More cogs, Less revolutions (Indirect Proportion)
  Cogs Revolutions made
  5 27
  15 x
  
  5:15=x:27
  So., x=5*27/15
  i.e, x=9
  
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