IN a class of 15 students 7 read latin,8 read greeks,3 not either.how many of them read both latin and greek?

• 3 students does not know either, so 12 student are remaining
  from that 12................4 knows only latin, 5 knows only greek and 3 knows both.
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• 3 students read both languages
  
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• 3 students study both the subjects
  
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• the total number in a class is 15. 7 read latin, 8 read greeks while 3 read none .
  7+8=15
  total number of student in d class 15-3 that did not study any language =12
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