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_25025 ( "District" text, "Vacator" text, "Reason for change" text, "Successor" text, "Date successor seated" text )

### Question ###
How many seats became avaliable in Massachusetts 3rd district?

### Accurate SQL ###

SELECT COUNT("Vacator") FROM table_25025 WHERE "District" = 'Massachusetts 3rd'