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_48 (lane INTEGER, heat_rank VARCHAR)
### Question:
In heat rank 7, what is the sum of lanes?
### Answer:
SELECT SUM(lane) FROM table_name_48 WHERE heat_rank = 7