What is the average of goals against, where overall goals are more than 35 and the goal difference is 20?
CREATE TABLE table_name_68 (
    goals_against INTEGER,
    goals_for VARCHAR,
    goal_difference VARCHAR
)
SELECT AVG(goals_against) FROM table_name_68 WHERE goals_for > 35 AND goal_difference = 20
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the average of goals against, where overall goals are more than 35 and the goal difference is 20? ### Input: CREATE TABLE table_name_68 (
    goals_against INTEGER,
    goals_for VARCHAR,
    goal_difference VARCHAR
) ### Response: SELECT AVG(goals_against) FROM table_name_68 WHERE goals_for > 35 AND goal_difference = 20