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
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_13836704_7 (international_passengers VARCHAR, rank VARCHAR) Question: What is the total number of passengers of the airport ranked 15? [/INST] SELECT international_passengers FROM table_13836704_7 WHERE rank = 15 </s>