How man teams had a total weight of 57.5?
CREATE TABLE table_2581397_3 (
    group VARCHAR,
    weight__kg_ VARCHAR
)
SELECT COUNT(group) FROM table_2581397_3 WHERE weight__kg_ = "57.5"
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 man teams had a total weight of 57.5? ### Input: CREATE TABLE table_2581397_3 (
    group VARCHAR,
    weight__kg_ VARCHAR
) ### Response: SELECT COUNT(group) FROM table_2581397_3 WHERE weight__kg_ = "57.5"