user: Question: What place was the horse with a barrier of 20 and weighing less than 54 kg
Columns: ['Saddle cloth', 'Horse', 'Trainer', 'Jockey', 'Weight (kg)', 'Barrier [b ]', 'Placing']
Types: ['real', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: [1.0, 'Septimus', "Aidan O'Brien", 'J P Murtagh', 58.5, '10', '18']
SQL:

assistant: SELECT "Placing" FROM "Table" WHERE "Weight (kg)" < 54.0 AND "Barrier [b ]" = '20';