CREATE TABLE table_name_52 (house_of_rep_seats INT, abbr VARCHAR)

What is the average number of House of Representatives seats had an abbreviation of d66?
SELECT AVG(house_of_rep_seats) FROM table_name_52 WHERE abbr = "d66"
SELECT AVG("house_of_rep_seats") FROM "table_name_52" WHERE "abbr" = "d66"