CREATE TABLE table_66298 ("School" TEXT, "Location" TEXT, "Mascot" TEXT, "Size" FLOAT, "IHSAA Class" TEXT, "County" TEXT)

Which Size has an IHSAA Class of aa, and a Location of milan?
SELECT SUM("Size") FROM table_66298 WHERE "IHSAA Class" = 'aa' AND "Location" = 'milan'
SELECT SUM("Size") FROM "table_66298" WHERE "IHSAA Class" = 'aa' AND "Location" = 'milan'