Name the number of high rebounds for april 21
CREATE TABLE table_17621978_11 (high_rebounds VARCHAR, date VARCHAR)
SELECT COUNT(high_rebounds) FROM table_17621978_11 WHERE date = "April 21"
### Context: CREATE TABLE table_17621978_11 (high_rebounds VARCHAR, date VARCHAR) ### Question: Name the number of high rebounds for april 21 ### Answer: SELECT COUNT(high_rebounds) FROM table_17621978_11 WHERE date = "April 21"