Table schema:
CREATE TABLE table_name_50 (november VARCHAR, september VARCHAR, february VARCHAR, march VARCHAR)

Question: What is the total number for November, larger than 8.53 in February, 20.21 in March, and less than 7.9 in September?
SQL: SELECT COUNT(november) FROM table_name_50 WHERE february > 8.53 AND march = 20.21 AND september < 7.9