CREATE TABLE table_29190 ("Rank" FLOAT, "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)

When 21' 18.87 106.209mph is Tuesday August 24th what is Monday August 23rd?
SELECT "Mon 23 Aug" FROM table_29190 WHERE "Tues 24 Aug" = '21'' 18.87 106.209mph'
SELECT "Mon 23 Aug" FROM "table_29190" WHERE "Tues 24 Aug" = '21\' 18.87 106.209mph'