Question: how many states have right to work laws
[{'answer': '27'}, {'provenance': [{'wikipedia_id': '392198', 'title': 'Right-to-work law', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 359, 'bleu_score': 0.8435759619123581, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5665247541718001496}, 'section': 'Section::::Abstract.'}]}]