Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_90 (_number___county VARCHAR, year_joined VARCHAR, location VARCHAR)
### Question:
which # / county is correct for year less than 1981 and chalmers as location?
### Answer:
SELECT _number___county FROM table_name_90 WHERE year_joined < 1981 AND location = "chalmers"