[
  "Draw a bar model using the three-way ratio from part (a): Andy : Mother : Father = 12 : 15 : 16.",
  "Difference between Mother and Andy = 15 - 12 = 3 units = 33 cm. So 1 unit = 33 / 3 = 11 cm.",
  "Father = 16 units = 16 x 11 = 176 cm."
]