In a group of children, 35 play football out of which 20 play footballs only, 22 play hockey; 25 play cricket out of which 11 play cricket only. Out of these 7 play cricket and football but bot hockey, 3 play football and hockey but not cricket and 12 play football and cricket both.

How many plays hockey only ?

12

Number of players playing hockey only = 12.

Hence (3) is the correct answer.