Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_11066073_1 (colour VARCHAR, registration_no VARCHAR)
### Question:
What is the number of colour with the regisration number of mg-509?
### Answer:
SELECT COUNT(colour) FROM table_11066073_1 WHERE registration_no = "MG-509"