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_46 (guests INTEGER, ship_name VARCHAR, year_built VARCHAR)
### Question:
What is the number of guests for the Viking Ingvar, built earlier than 1990?
### Answer:
SELECT AVG(guests) FROM table_name_46 WHERE ship_name = "viking ingvar" AND year_built < 1990