Which entry has the highest laps of those with constructor Minardi - Fondmetal, driver Marc Gené, and a grid larger than 20?
CREATE TABLE "race" (
  "driver" text,
  "constructor" text,
  "laps" real,
  "time_retired" text,
  "grid" real
);
SELECT MAX("laps") FROM "race" WHERE "constructor"='minardi - fondmetal' AND "driver"='marc gené' AND "grid">20;