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 (wins INTEGER, position VARCHAR, f_laps VARCHAR)
### Question:
What is the average wins with a 20th position and more than 0 f/laps?
### Answer:
SELECT AVG(wins) FROM table_name_31 WHERE position = "20th" AND f_laps > 0