How many viewers have an Air Date of march 20, 2008, and an 18-49 (Rating/Share) of 2.3/7?
CREATE TABLE table_53883 (
    "Episode" text,
    "Air Date" text,
    "Timeslot" text,
    "Rating" real,
    "Share" real,
    "18-49 (Rating/Share)" text,
    "Viewers (m)" real,
    "Rank (Timeslot)" real,
    "Rank (Night)" text,
    "Rank (Overall)" real
)
SELECT "Viewers (m)" FROM table_53883 WHERE "Air Date" = 'march 20, 2008' AND "18-49 (Rating/Share)" = '2.3/7'
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 viewers have an Air Date of march 20, 2008, and an 18-49 (Rating/Share) of 2.3/7? ### Input: CREATE TABLE table_53883 (
    "Episode" text,
    "Air Date" text,
    "Timeslot" text,
    "Rating" real,
    "Share" real,
    "18-49 (Rating/Share)" text,
    "Viewers (m)" real,
    "Rank (Timeslot)" real,
    "Rank (Night)" text,
    "Rank (Overall)" real
) ### Response: SELECT "Viewers (m)" FROM table_53883 WHERE "Air Date" = 'march 20, 2008' AND "18-49 (Rating/Share)" = '2.3/7'