The average number of students in class A and B is 39. The average number of students in class A, B and C is 42. The average number of students in class A, B, C and D is 45. The average number of students in class A, C and D is 46. The average number of students in class B and E is 45. What is the average number of students per class considering all the classes together?
1
45.6
2
44.8
3
42.2
4
40.4