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  # Pleeaassee help me
  
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  a wheel spins at a rate of 9 revolutions for 5 seconds. How long will it take to spin for 20 revolutions?
  
  colbster  Apr 3, 2017
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  5 / 9   =   x / 20        cross-multiply
  
  20 * 5  = 9 * x        divide both sides by 9
  
  [ 20 * 5 ] / 9   = x
  
  100 / 9    = x   =   11 + 1/9     seconds
  
  CPhill  Apr 3, 2017