Context: CREATE TABLE table_23248420_1 (rank VARCHAR, city_town VARCHAR, country VARCHAR, county VARCHAR)
Question: When birkenhead is the city/town and merseyside is the county and england is the country how many ranks are there?
Answer: SELECT COUNT(rank) FROM table_23248420_1 WHERE country = "England" AND county = "Merseyside" AND city_town = "Birkenhead"