user: ### NOW ANSWER:
Question: When 21' 18.87 106.209mph is Tuesday August 24th what is Monday August 23rd?
Columns: ['Rank', 'Rider', 'Sat 21 Aug', 'Mon 23 Aug', 'Tues 24 Aug', 'Wed 25 Aug', 'Thurs 26 Aug', 'Fri 27 Aug', 'Sat 29 Aug']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Dan Sayle 250cc Honda', 'Untimed Practice', "23' 34.55 96.022mph", "20' 08.34 112.409mph", "19' 45.20 114.603mph", "19' 43.42 114.776mph", "19' 25.91 116.500mph", '—— No Time']
SQL:

assistant: SELECT "Mon 23 Aug" FROM "Table" WHERE "Tues 24 Aug" = '21'' 18.87 106.209mph';