Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_25 (students INTEGER, pupil_teacher_ratio VARCHAR)
### Question:
What is the average number of students for schools with a pupil to teacher ratio of 25.1?
### Answer:
SELECT AVG(students) FROM table_name_25 WHERE pupil_teacher_ratio = 25.1