[
  "Draw a bar model: The age gap never changes. Gap = 76 - 13 = 63 years.",
  "When Grandmother was 8 times James: James = 1 unit, Grandmother = 8 units. Gap = 7 units = 63. So 1 unit = 63 / 7 = 9. James was 9 years old.",
  "Years ago = 13 - 9 = 4. Answer: 4 years ago."
]