CREATE TABLE table_name_37 (b_score NUMBER, a_score VARCHAR2, total VARCHAR2)

what is the sum of the b score when the a score is 6.6 and the total is 15.6?
SELECT SUM(b_score) FROM table_name_37 WHERE a_score = 6.6 AND total = 15.6
SELECT SUM("b_score") FROM "table_name_37" WHERE "a_score" = 6.6 AND "total" = 15.6