went to school in chicago 43 to 56 most classrooms had 48 seats kids learned teachers had control
I had about that many in my class in the 50s, 60s.
Kids knew to behave or get it at home.
Those classrooms that have over 15 students being taught by one teacher all day (elementary) than maybe a law should be passed that an adult on public assistance would be required to sit in that class the whole day to help keep the kids under control so the teacher can do the job they are paid to do.