CREATE TABLE table_name_67 (matches INT, overs VARCHAR, economy_rate VARCHAR)

How many matches were played that resulted in less than 59.1 overs and a 6.78 Economy rate?
SELECT SUM(matches) FROM table_name_67 WHERE overs < 59.1 AND economy_rate > 6.78
SELECT SUM("matches") FROM "table_name_67" WHERE "economy_rate" > 6.78 AND "overs" < 59.1