CREATE TABLE table_13836704_7 (freight___metric_tonnes__ VARCHAR, transit_passengers VARCHAR)

What are the total freights in metric tonnes when the total transit passengers is 147791?
SELECT freight___metric_tonnes__ FROM table_13836704_7 WHERE transit_passengers = 147791
SELECT "freight___metric_tonnes__" FROM "table_13836704_7" WHERE "transit_passengers" = 147791