How many have a length of 375?
CREATE TABLE table_20940 (
    "Number" real,
    "Name" text,
    "Kilometer" real,
    "Pavement" text,
    "Length (m)" real,
    "Average climb (%)" real
)
SELECT COUNT("Average climb (%)") FROM table_20940 WHERE "Length (m)" = '375'
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: How many have a length of 375? ### Input: CREATE TABLE table_20940 (
    "Number" real,
    "Name" text,
    "Kilometer" real,
    "Pavement" text,
    "Length (m)" real,
    "Average climb (%)" real
) ### Response: SELECT COUNT("Average climb (%)") FROM table_20940 WHERE "Length (m)" = '375'