IN A CLASS OF 33, 20 PLAY CRICKET, 25 PLAY FOOTBALL AND 18 PLAY HO...

17. In a class of 33, 20 play cricket, 25 play football and 18 play hockey. 15 play both cricket and football, 12 play football and hockey and 10 play cricket and hockey. If each student plays at least one game, how many students play only cricket?