An employer pays Rs.20 for each day a worker works and for feits Rs.3 for each day is ideal at the end of sixty days a worker gets Rs.280 . for how many days did the worker remain ideal?

• ans:40 days he will be ideal
  because if he work for 20 days then he get =20*20=Rs.400
  and left 40 days he will not work so for this employer feits Rs.120
  now total earning of a worker =400-120=280
  
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