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_75489 ( "Rank" real, "Nation" text, "Gold" real, "Silver" real, "Bronze" real, "Total" real )

### Question ###
Which Silver has a Gold of 2, and a Nation of puerto rico, and a Total smaller than 12?

### Accurate SQL ###

SELECT SUM("Silver") FROM table_75489 WHERE "Gold" = '2' AND "Nation" = 'puerto rico' AND "Total" < '12'