what is the average total when bronze is more than 0, gold is 0, the nation is united states (usa) and silver is 0?
CREATE TABLE table_50718 (
    "Rank" real,
    "Nation" text,
    "Gold" real,
    "Silver" real,
    "Bronze" real,
    "Total" real
)
SELECT AVG("Total") FROM table_50718 WHERE "Bronze" > '0' AND "Gold" = '0' AND "Nation" = 'united states (usa)' AND "Silver" < '0'
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 total when bronze is more than 0, gold is 0, the nation is united states (usa) and silver is 0? ### Input: CREATE TABLE table_50718 (
    "Rank" real,
    "Nation" text,
    "Gold" real,
    "Silver" real,
    "Bronze" real,
    "Total" real
) ### Response: SELECT AVG("Total") FROM table_50718 WHERE "Bronze" > '0' AND "Gold" = '0' AND "Nation" = 'united states (usa)' AND "Silver" < '0'