What is the average finish that has 24 as the start, with a year after 1987?
CREATE TABLE table_42847 (
    "Year" real,
    "Chassis" text,
    "Engine" text,
    "Start" real,
    "Finish" real,
    "Entrant" text
)
SELECT AVG("Finish") FROM table_42847 WHERE "Start" = '24' AND "Year" > '1987'
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 finish that has 24 as the start, with a year after 1987? ### Input: CREATE TABLE table_42847 (
    "Year" real,
    "Chassis" text,
    "Engine" text,
    "Start" real,
    "Finish" real,
    "Entrant" text
) ### Response: SELECT AVG("Finish") FROM table_42847 WHERE "Start" = '24' AND "Year" > '1987'