What was the total opponents points for the game were the Oilers scored 21?
CREATE TABLE table_72740 (
    "Game" real,
    "Date" text,
    "Opponent" text,
    "Result" text,
    "Oilers points" real,
    "Opponents" real,
    "Oilers first downs" real,
    "Record" text,
    "Attendance" real
)
SELECT "Opponents" FROM table_72740 WHERE "Oilers points" = '21'
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 was the total opponents points for the game were the Oilers scored 21? ### Input: CREATE TABLE table_72740 (
    "Game" real,
    "Date" text,
    "Opponent" text,
    "Result" text,
    "Oilers points" real,
    "Opponents" real,
    "Oilers first downs" real,
    "Record" text,
    "Attendance" real
) ### Response: SELECT "Opponents" FROM table_72740 WHERE "Oilers points" = '21'