[
  "Draw a bar model: this is a remainder problem. First find the remaining money after cards, then find 2/3 of that remainder.",
  "Remaining after cards = 1 - 1/4 = 3/4. Spent on food = 2/3 x 3/4 = 6/12 = 1/2.",
  "Max spent 1/2 of his money on food. Answer: 1/2 (option B)."
]