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_20 (area__km_2__ VARCHAR, population INTEGER)
### Question:
What's the sum of the Area (KM 2) that's got a Population that's smaller than 90?
### Answer:
SELECT COUNT(area__km_2__) FROM table_name_20 WHERE population < 90