What is the total number of passengers of the airport ranked 15?
CREATE TABLE table_13836704_7 (international_passengers VARCHAR, rank VARCHAR)
SELECT international_passengers FROM table_13836704_7 WHERE rank = 15
### Context: CREATE TABLE table_13836704_7 (international_passengers VARCHAR, rank VARCHAR) ### Question: What is the total number of passengers of the airport ranked 15? ### Answer: SELECT international_passengers FROM table_13836704_7 WHERE rank = 15