What is the total number in class for the Whitehaven Coal?
CREATE TABLE table_51103 (
    "Owner" text,
    "Class" text,
    "Number in class" real,
    "Road numbers" text,
    "Built" text
)
SELECT SUM("Number in class") FROM table_51103 WHERE "Owner" = 'whitehaven coal'
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 total number in class for the Whitehaven Coal? ### Input: CREATE TABLE table_51103 (
    "Owner" text,
    "Class" text,
    "Number in class" real,
    "Road numbers" text,
    "Built" text
) ### Response: SELECT SUM("Number in class") FROM table_51103 WHERE "Owner" = 'whitehaven coal'