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_84 (laps INTEGER, grid VARCHAR, time_retired VARCHAR, manufacturer VARCHAR)
### Question:
What is the average number of laps with an accident time/retired, aprilia manufacturer and a grid of 27?
### Answer:
SELECT AVG(laps) FROM table_name_84 WHERE time_retired = "accident" AND manufacturer = "aprilia" AND grid = 27