12 revolutions takes 1/8 th second time. In 20 seconds how many revolutions

• ans-1920 revolutions
  for 1/8 sec 12 rev then for 1 sec=12/(1/8)=96rev.
  now 1sec=96 rev then for 20 sec =? rev
  =>20*96=1920rev
  
• 10 years agoHelpfull: Yes(42) No(2)
• Solution:
  Clearly 12 revolution takes 1/8 second,
  . x revolution takes 20 seconds
  Then it's says direct propagation
  Revolution Seconds
  12 1/8
  ? 20
  1/8:20::12:x
  
  x/8=20*12
  
  x=(20*12)*8==> 1920 revolution....
• 10 years agoHelpfull: Yes(8) No(0)
• In 20 seconds = 20*96 = 1920 (A Love Story)
• 10 years agoHelpfull: Yes(8) No(0)
• 1/8:20::12:x
  x=1920 sec
• 10 years agoHelpfull: Yes(5) No(0)
• 12 revolutions =1/8 sec then 1 sec=12*8 so 20 sec=20*8*12=1920
  
• 10 years agoHelpfull: Yes(1) No(0)
• 1/8 seconds-12 revolutions
  20 seconds- (12*20)/(1/8) =12*20*8 =1920
  So ans-1920 revolutions
  
• 10 years agoHelpfull: Yes(1) No(0)
• x=96
  20sec*96=1920
• 3 years agoHelpfull: Yes(0) No(0)