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_225099_3 (date_of_successors_formal_installation VARCHAR, successor VARCHAR)
### Question:
How many entries are shown for date of successors formal installation where successor is john w. walker (dr)?
### Answer:
SELECT COUNT(date_of_successors_formal_installation) FROM table_225099_3 WHERE successor = "John W. Walker (DR)"