CREATE TABLE table_13555999_1 (university_students_and_adults__18yrs VARCHAR(255), _ VARCHAR(255), senior_high_school__15_18_yrs_ VARCHAR(255))
What amount of the university students and adults ehre the the senior high school is 26mm?
    
SQL: SELECT university_students_and_adults__18yrs + _ FROM table_13555999_1 WHERE senior_high_school__15_18_yrs_ = "26mm"