Let the number of students = 100 Number of students failed in English = 52 Number of students failed in Mathematics = +42 Total students failed in English and Mathematics = 94 Number of failed students in both the subjects the = 17 Number of students failed in the class = 94 - 17 = 77 students Number of students passed in both the subjects = 100 - 77 = 23 students Percentage of candidates = 23%