In a school there, are 250 students, and every student plays atleast one of the three indoor games of Chess, Carrom or Sudoku. 110, 90 and 100 students play Chess Carrom and Sudoku, respectively. 20 students play Chess and Carrom, 20 students play Carrom and Sudoku and 25 students play Chess and Sudoku.
The number of students who play all the three game is
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