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_66186 ( "School" text, "City" text, "Team Name" text, "Enrollment 08-09" real, "IHSAA Class" text, "County" text, "Year Joined" text, "Previous Counference" text )

### Question ###
What is the average enrollment 08=09, for the team that had a previous conference of lake and IHSAA class of 3A?

### Accurate SQL ###

SELECT AVG("Enrollment 08-09") FROM table_66186 WHERE "Previous Counference" = 'lake' AND "IHSAA Class" = '3a'