Problem-solution paragraph (Overcrowded classrooms)

    Overcrowded classrooms are a serious problem in the current colleges and universities because they make students' marks get worse.
When students are in a very crowded classrooms they do not listen what teacher says fully, so they tend to think about other things or do what they feel like doing. They also speak more often with their classmates since there are a lot of people, and the ones that sit in the end find it easier to do it since the teacher cannot see them.
    The main solution to this problrm is to reduce the amount of students in a classroom, which is in the teachers' hands. But how can teachers do this?
They shoud divide the cass into two classes in such a way that each half goes with a different teacher. If they divide the students, the classrooms won't be as crowded so the students will be able to listen the teacher easier and improve their results.