The number of male students in class 61 is equal to that in class 62. The number of male students in class 61 accounts for 50% of the total number of students in the class, and the number of male students in class 62 accounts for 60% of the total number of students in the class

The number of male students in class 61 is equal to that in class 62. The number of male students in class 61 accounts for 50% of the total number of students in the class, and the number of male students in class 62 accounts for 60% of the total number of students in the class

More than one class
The number of boys in two classes is 3x
3x / 0.5 = 6x for class 1
6 = 5x