What is the area of the coed school with a state authority and a roll number of 122?
CREATE TABLE "wanganui_district" (
  "name" text,
  "years" text,
  "gender" text,
  "area" text,
  "authority" text,
  "decile" real,
  "roll" real
);
SELECT "area" FROM "wanganui_district" WHERE "authority"='state' AND "gender"='coed' AND "roll"=122;