In the auditorium, students placed 625 chairs, 25 chairs in a row. How many rows did you get?

By the condition of the problem, we know the total number of chairs arranged in the auditorium (625 chairs) and the number of chairs in each row (25 chairs in one row). Since the problem does not say whether the number of chairs is the same in each row, we will accept the fact that each row has the same number of chairs (25 chairs in a row). Hence, in order to find the number of rows in the auditorium, it is necessary to divide the total number of chairs by the number of chairs in one row, that is, 625/25 = 25 rows.
Answer: in the auditorium, the chairs are arranged in 25 rows.