On my own the number of every gender can be various in every subject, and it doesn't matter how many people of every gender are studying on any subject.
Firstly, the number of students on different subjects can be different due to the interest and recommendation for types of lessons among students with different genders. For example, the male students would be keen on to science, and female to literature and languages. However, the number of students can change due to the choise of professions.
Secondly, the equal number of students in any subject is also nice dicision due to the same interest to one subject on every gender, consequently, various and equal number of students can't influent to the quality of lesson or education. And the same number of students can be provided with equal knowledge during the lesson.
In conclusion, i am agree with the equality between the number of male and female students due to efficiency and productivity of lessons.