In a class of boys A is 34th from left and 27th from the right those who have passed the exam. If the ratio of pass to fail candidates is 4 : 1; then what is the total number of students in class?

80 60 75 72

75

Total passed students   = 34 + 27 – 1 = 60 Pass : Fail = 4 : 1 = 60 ; 15 Total students = 60 + 15 ⇒ 75