Question: What was the average capacity for Vélez Sársfield?
SQL: SELECT AVG("Capacity") FROM "2-18439613-1" WHERE "Home team(s)" = 'Vélez Sársfield';

Question: What city was the home team Tigre?
SQL: SELECT "City" FROM "2-18439613-1" WHERE "Home team(s)" = 'Tigre';

Question: What province is in Mendoza with a stadium Feliciano Gambarte?
SQL: SELECT "Province" FROM "2-18439613-1" WHERE "City" = 'Mendoza' AND "Stadium" = 'Feliciano Gambarte';