What is the time for a grid greater than 20, fewer than 26 laps, and the Aprilia manufacturer?
CREATE TABLE "250cc_classification" (
  "rider" text,
  "manufacturer" text,
  "laps" real,
  "time_retired" text,
  "grid" real
);
SELECT "time_retired" FROM "250cc_classification" WHERE "grid">20 AND "laps"<26 AND "manufacturer"='aprilia';