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_27922491_20 (bbi VARCHAR, average VARCHAR)
### Question:
What was the BBI for the bowler whose average is 24.50?
### Answer:
SELECT bbi FROM table_27922491_20 WHERE average = "24.50"