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_30 (matches INTEGER, goals VARCHAR, average VARCHAR)
### Question:
What is the total of Matches with Goals of 18, and an Average larger than 0.55?
### Answer:
SELECT SUM(matches) FROM table_name_30 WHERE goals = 18 AND average > 0.55