Table schema:
CREATE TABLE table_25042332_22 (primary__6_13_years_ VARCHAR, preschool__0_5_years_ VARCHAR)

Question: What is the enrollment ration in primary in the region where the enrollment ratio in preschool is 50.23? 
SQL: SELECT primary__6_13_years_ FROM table_25042332_22 WHERE preschool__0_5_years_ = "50.23"