Class 6A has 40 students, every student likes playing at least one of three sports: football, basketball and badminton. Knowing that 10 students like playing all three sports, 15 students like playing football and basketball, 12 students like playing football and badminton, 12 students like playing basketball and badminton. How many students like playing only one sport

Class 6A has 40 students , every student likes playing at least one of three sports: football, basketball and badminton. Knowing that 10 students like playing all three sports, 15 students like playing football and basketball, 12 students like playing football and badminton, 12 students like playing basketball and badminton. How many students like playing only one sport?

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