The students in A, B, C classes are in the ratio 4 : 6 : 9. If 12 students are increased in each class, the ratio changes to 7 : 9 : 12. Then the total number of students in the B Class before the increase is
1
36
2
24
3
54
4
30
The students in A, B, C classes are in the ratio 4 : 6 : 9. If 12 students are increased in each class, the ratio changes to 7 : 9 : 12. Then the total number of students in the B Class before the increase is