When 21' 10.25 106.930mph is Tuesday August 24th what is Saturday August 29th?
CREATE TABLE "2010_lightweight_manx_grand_prix_practic" (
  "rank" real,
  "rider" text,
  "sat_21_aug" text,
  "mon_23_aug" text,
  "tues_24_aug" text,
  "wed_25_aug" text,
  "thurs_26_aug" text,
  "fri_27_aug" text,
  "sat_29_aug" text
);
SELECT "sat_29_aug" FROM "2010_lightweight_manx_grand_prix_practic" WHERE "tues_24_aug"='21'' 10.25 106.930mph';