a b and c are non negative integers such that 28a+30b+31c=365

• 365 is the total number of days of the year (except leap year )
  and when we look at the calender then there are
  7------31 days month
  4------30 days month
  1------28 days month
  so we can write a = 1, b=4 and c=7
  
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• a b c are the no of months with 28 days , 30 days and 31 days
  
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• 12
  
  365 is the total nmbr of days in a year.
  and thr r total 12 months of 28 days 30 days and 31 days..
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• a=1 b=4 c=7
  28 days month =1
  30 days months=4
  31 days months=7
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• a=1, b=4, c=7 (in a year we have one Mon with 28, 4 Mon with 30, 7 Mon with 31 days)
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• a+b+c=12
  They are the months of year
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• 12 bcoz it form a 12 month days addition
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