How many faculty members have 20 years of experience? 
CREATE TABLE table_17384764_1 (designation VARCHAR, experience VARCHAR)
SELECT COUNT(designation) FROM table_17384764_1 WHERE experience = "20 years"
### Context: CREATE TABLE table_17384764_1 (designation VARCHAR, experience VARCHAR) ### Question: How many faculty members have 20 years of experience?  ### Answer: SELECT COUNT(designation) FROM table_17384764_1 WHERE experience = "20 years"