what is the total number of students in the class? Number of studying Biology Number No studying biology Total Number of Boy 18 Number of Girl Total 26 (1) Of the boy in the class, 15 were studying biology; (2) The number of girls in the class is twice the number of students in the class who are not studying biology; The answer given is C; but B is correct since: 18+2x=26+x , so x=8 and the total number is 34;