How many constructors are listed for the XVI BRDC international trophy race
CREATE TABLE table_1140103_6 (constructor VARCHAR, race_name VARCHAR)
SELECT COUNT(constructor) FROM table_1140103_6 WHERE race_name = "XVI BRDC International Trophy"
### Context: CREATE TABLE table_1140103_6 (constructor VARCHAR, race_name VARCHAR) ### Question: How many constructors are listed for the XVI BRDC international trophy race ### Answer: SELECT COUNT(constructor) FROM table_1140103_6 WHERE race_name = "XVI BRDC International Trophy"