Let the number of boys in the group be x. Number of girls in the group = 0.7x. x+0.7x=85⇒x=50 Number of boys playing badminton = 60% of 50 = 30. Number of boys playing onlybadminton = 50% of 50 = 25. Number of children playing onlytable tennis = 40% of 85 = 34. Number of children playing bothbadminton and table tennis = 12.Number of children playing only badminton=85–(34+12)=39. Number of girls playing onlybadminton =39–25=14.