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_45 (against INTEGER, date VARCHAR)
### Question:
What was the average of againsts on 21/5/1997?
### Answer:
SELECT AVG(against) FROM table_name_45 WHERE date = "21/5/1997"