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_name_28 (length VARCHAR, remarks VARCHAR)
### Question:
What is the length of the highway with remarks that it was replaced by lp 20?
### Answer:
SELECT length FROM table_name_28 WHERE remarks = "replaced by lp 20"