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_20 (ast_avg INTEGER, rank VARCHAR, games VARCHAR)
### Question:
WHAT IS THE SUM OF AST AVG WITH RANK 5 AND GAMES BIGGER THAN 108?
### Answer:
SELECT SUM(ast_avg) FROM table_name_20 WHERE rank = 5 AND games > 108