How many upstream speeds are there for downstream of 20 mbit/s and bandwidth of 40 gb?
CREATE TABLE table_21477 (
    "Downstream" text,
    "Upstream" text,
    "Bandwidth" text,
    "Price TL" text,
    "Every 1 GB" text,
    "MAX" text
)
SELECT COUNT("Upstream") FROM table_21477 WHERE "Downstream" = '20 Mbit/s' AND "Bandwidth" = '40 GB'
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 upstream speeds are there for downstream of 20 mbit/s and bandwidth of 40 gb? ### Input: CREATE TABLE table_21477 (
    "Downstream" text,
    "Upstream" text,
    "Bandwidth" text,
    "Price TL" text,
    "Every 1 GB" text,
    "MAX" text
) ### Response: SELECT COUNT("Upstream") FROM table_21477 WHERE "Downstream" = '20 Mbit/s' AND "Bandwidth" = '40 GB'