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_53 (laps INTEGER, time_retired VARCHAR, grid VARCHAR)
### Question:
What is the mean number of laps where Time/retired was a water leak and the grid number was bigger than 12?
### Answer:
SELECT AVG(laps) FROM table_name_53 WHERE time_retired = "water leak" AND grid > 12