{
  "question_id": 5119,
  "hints": [
    {
      "hint_level": 1,
      "hint": "Use P = 2(L + B)."
    },
    {
      "hint_level": 2,
      "hint": "L = r + 2, B = r."
    },
    {
      "hint_level": 3,
      "hint": "2(r + 2 + r) = 2(2r + 2) = 4r + 4."
    }
  ]
}