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_18064020_21 (ast VARCHAR, avg VARCHAR)
### Question:
How many tackle assists for the player who averages 23.7?
### Answer:
SELECT ast FROM table_18064020_21 WHERE avg = "23.7"