CREATE TABLE table_35549 ("School" CLOB, "Location" CLOB, "Mascot" CLOB, "Enrollment" FLOAT, "IHSAA Class" CLOB, "IHSAA Football Class" CLOB, "# / County" CLOB)

Name the IHSAA class with county 18 delaware and tigers mascot
SELECT "IHSAA Class" FROM table_35549 WHERE "# / County" = '18 delaware' AND "Mascot" = 'tigers'
SELECT "IHSAA Class" FROM "table_35549" WHERE "# / County" = '18 delaware' AND "Mascot" = 'tigers'