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  Q)
  
  # A work can be completed by 40 workers in 40 days. If 5 workers leave every 10 days, in how many days work will be completed ?
  
  ( A ) 56, 44
  ( B ) 56, 66
  ( C ) 58, 66
  ( D ) 55, 66
  
  Comment
  A)
  
  Total men days = 40 *40 = 1600 men-days.
  40 men work for 10 days = 400 men days
  35men work for 10 days = 350 men days
  30 men work for 10 days = 300 men days.
  25 men work for 10 days = 250 men days
  20 men work for 10 men days = 200 men days.
  Total men days till now = 400 +350 +300 +250 +200 = 1500 men days.
  Rest men days = 1600 - 1500 = 100 men days.
  Now 15 men will work for complete  100 men days in = 100/15 = 6.66 days.
  So total days = 10*5 + 6.66 = 56.66 days.
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