What are the names of all of the students?
select lastname,firstname from list
How many students are in that classroom?
select count ( * ) from list group by classroom order by count ( * ) desc limit 1
What is the name of the teacher who teaches in that classroom?
select t2.firstname, t2.lastname from list as t1 join teachers as t2 on t1.classroom = t2.classroom group by t2.firstname, t2.lastname order by count ( * ) desc limit 1