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_31 (change INTEGER, centre VARCHAR, rank VARCHAR)
### Question:
Which Change is the average one that has a Centre of buenos aires, and a Rank smaller than 46?
### Answer:
SELECT AVG(change) FROM table_name_31 WHERE centre = "buenos aires" AND rank < 46