Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_47 ( markatal INTEGER, inhabitants_per_km² VARCHAR, area__in_km²_ VARCHAR )

### Question ###
What is the sum of Markatal, when Inhabitants Per Km is less than 13, and when Area (in Km ) is 27?

### Accurate SQL ###

SELECT SUM(markatal) FROM table_name_47 WHERE inhabitants_per_km² < 13 AND area__in_km²_ = 27