Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_18811 ( "Specification" text, "Gender" text, "Junior High School (12\u201315 yrs)" text, "Senior High School (15\u201318 yrs)" text, "University students and Adults (18yrs+)" text )

### Question ###
What amount of the university students and adults ehre the the senior high school is 26mm?

### Accurate SQL ###

SELECT "University students and Adults (18yrs+)" FROM table_18811 WHERE "Senior High School (15\u201318 yrs)" = '26mm'