{
  "question_id": 5111,
  "hints": [
    {
      "hint_level": 1,
      "hint": "Kim has m tennis balls."
    },
    {
      "hint_level": 2,
      "hint": "Henry has twice as many."
    },
    {
      "hint_level": 3,
      "hint": "Multiply: 2 x m = 2m."
    }
  ]
}