question: Name the total number of population hervey bay with population woocoo less than 640 and population of maryborough less than 19,257
answer: SELECT COUNT(population__hervey_bay_) FROM table_name_94 WHERE population__woocoo_ < 640 AND population__maryborough_ < 19 OFFSET 257
context: CREATE TABLE table_name_94 (population__hervey_bay_ VARCHAR, population__woocoo_ VARCHAR, population__maryborough_ VARCHAR)