What is the highest BR number with a SECR number of 765?
CREATE TABLE table_48880 (
    "SECR No." real,
    "SR No." real,
    "BR No." real,
    "Builder" text,
    "Date Delivered" text,
    "Date Withdrawn" text
)
SELECT MAX("BR No.") FROM table_48880 WHERE "SECR No." = '765'
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 highest BR number with a SECR number of 765? ### Input: CREATE TABLE table_48880 (
    "SECR No." real,
    "SR No." real,
    "BR No." real,
    "Builder" text,
    "Date Delivered" text,
    "Date Withdrawn" text
) ### Response: SELECT MAX("BR No.") FROM table_48880 WHERE "SECR No." = '765'