What is the Quantity of the engine Model PG-2901?
CREATE TABLE table_62874 (
    "Model" text,
    "Built" text,
    "Quantity" real,
    "Seats" real,
    "Length" text,
    "Engine" text
)
SELECT "Quantity" FROM table_62874 WHERE "Model" = 'pg-2901'
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 Quantity of the engine Model PG-2901? ### Input: CREATE TABLE table_62874 (
    "Model" text,
    "Built" text,
    "Quantity" real,
    "Seats" real,
    "Length" text,
    "Engine" text
) ### Response: SELECT "Quantity" FROM table_62874 WHERE "Model" = 'pg-2901'