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_4 (heat VARCHAR, mark VARCHAR, react VARCHAR)
### Question:
What is the heat number at 7.63, and a reaction less than 0.229?
### Answer:
SELECT COUNT(heat) FROM table_name_4 WHERE mark = "7.63" AND react < 0.229