What is the enrollment ration in primary in the region where the enrollment ratio in preschool is 50.23?
create table table_25042332_22 (primary__6_13_years_ varchar, preschool__0_5_years_ varchar, PRIMARY KEY (primary__6_13_years_))
select primary__6_13_years_ from table_25042332_22 where preschool__0_5_years_ = "50.23"