[
  "First find how much meat was cooked (2/3 of 1/2 kg), then subtract from the total to find what is left.",
  "Cooked = 2/3 x 1/2 = 2/6 = 1/3 kg. Left = 1/2 - 1/3 = 3/6 - 2/6 = 1/6 kg.",
  "1/6 kg of meat was left. Answer: 1/6 (option C)."
]