[
  "Flour: 40% of 15 kg = 6 kg used, 9 kg remain. Sugar: 25% of 8 kg = 2 kg used, 6 kg remain.",
  "Total ingredients = 23 kg. Total remaining = 9 + 6 = 15 kg.",
  "Percentage not used = 15/23 * 100% = 65 5/23 %."
]