[
  "Tank 1 = 24 x 10 x 9 = 2160 cm^3. Tank 2 = 18 x 12 x 5 = 1080 cm^3.",
  "Total water = 2160 + 1080 = 3240 cm^3.",
  "Height = 3240 / (12 x 9) = 3240 / 108 = 30 cm."
]