[
  "Draw a bar model: The age gap never changes. Sarah was 29 when Jimmy was born, so the gap is always 29 years.",
  "In 4 years: Sarah = 2 units, Jimmy = 1 unit. Gap = 1 unit = 29. So Jimmy = 29, Sarah = 58. Now: Jimmy = 29 - 4 = 25, Sarah = 58 - 4 = 54.",
  "Answer: Sarah is 54, Jimmy is 25."
]