In the classroom, students just 20 people, because the teachers have taught the students and will be busy because of domestic students each school, there are many examples of 40 students per teacher, teach students to.
Give in the classroom, with students only 20 people because the teachers will have to teach all students thoroughly and rooms are not busy because in each student room in a dramatic 40 per class teachers teach students not thorough.
To the classroom with students just 20 people. Because the teacher to the school, all students thoroughly and class to not busy because of domestic each student room in the school very much have 40 per room make student teacher not thoroughly.