CREATE TABLE table_name_67 (lowest INT, stadium VARCHAR, average VARCHAR)

What's the highest lowest number of capacity that ibrox stadium has when the average is larger than 49,143?
SELECT MAX(lowest) FROM table_name_67 WHERE stadium = "ibrox stadium" AND average > 49 OFFSET 143
SELECT MAX("lowest") FROM "table_name_67" WHERE "average" > 49 AND "ibrox stadium" = "stadium" OFFSET 143