CREATE TABLE table_name_70 (total INT, b_score VARCHAR, gymnast VARCHAR)

What is the total when the B Score was 9.15 for Cheng Fei ( chn )?
SELECT AVG(total) FROM table_name_70 WHERE b_score = 9.15 AND gymnast = "cheng fei ( chn )"
SELECT AVG("total") FROM "table_name_70" WHERE "b_score" = 9.15 AND "cheng fei ( chn )" = "gymnast"