{
  "question_id": 5099,
  "hints": [
    {
      "hint_level": 1,
      "hint": "Total books = m."
    },
    {
      "hint_level": 2,
      "hint": "19 are fiction."
    },
    {
      "hint_level": 3,
      "hint": "Non-fiction books = m - 19."
    }
  ]
}