What is the number of total offense when the opponentis Penn State?
CREATE TABLE "single_game" (
  "rank" real,
  "player" text,
  "year" real,
  "opponent" text,
  "passing_yards" real,
  "rushing_yards" real,
  "total_offense" real
);
SELECT MAX("total_offense") FROM "single_game" WHERE "opponent"='Penn State';