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_27969432_3 ( original_air_date VARCHAR, written_by VARCHAR )

### Question ###
How many episodes were written by david j. north & janet tamaro?

### Accurate SQL ###

SELECT COUNT(original_air_date) FROM table_27969432_3 WHERE written_by = "David J. North & Janet Tamaro"