In a survey of 40 persons about their news paper reading habits ,it was found that all of them either read news paper H or I or T, 3 of them read all the three news papers , 8 of them read H and I,7 of them or I but not T is 25, number of persons who read either H or T but not I is 13, find the number of persons who read (i) H e number of persons who read (i) H only (ii) I only (iii) T only