There are 9 buses and 322 students.
Your teacher wants the buses to carry an equal number of students, however, when we do 322/9 to find out how many students are on each bus, the answer is 35.777777. Therefore, there cannot be an equal number of students on each bus, but it would be close.
We know that there will be approximately 36 students on each bus, because 35.7 rounds up to 36.
If you are looking for the exact answer, then there will be 7 buses with 36 students each, and 2 buses with 35 students each, because (36*7) + (35 *2) = 322 students total.
Hope this helps!