[
  "Draw a bar model: John = 12 units, Gilbert = 7 units, Ken = 10 units. Total units = 12 + 7 + 10 = 29.",
  "John has 6 more than Ken: 12 - 10 = 2 units = 6 stickers, so 1 unit = 6 / 2 = 3.",
  "Total = 29 x 3 = 87. They have 87 stickers altogether."
]