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_42 (attendance INTEGER, opponent VARCHAR, record VARCHAR)
### Question:
What is the attendance of the game that has the opponent of The Nationals with a record of 68-51?
### Answer:
SELECT SUM(attendance) FROM table_name_42 WHERE opponent = "nationals" AND record = "68-51"