SCHEMA:
CREATE TABLE table_name_51 (air_date VARCHAR, order VARCHAR)
USER:
What is the sum of numbers listed in 18-49 for the episode that aired on June 25, 2009 with an order larger than 29?

QUERY:
SELECT SUM(18 AS _49) FROM table_name_51 WHERE air_date = "june 25, 2009" AND order > 29