Tae Hun's graph

Today we finished our bar graph of how many students are in each class.  We found out that:

Room 15 has the most students in their class.

Room 2 has the least number or students in their class.

Room 1 has more students than room 2.

Room 18 has the same number of students as Room 19.

Room 21 has 24 students.

Room 22 has more students than Room 7.