[
  "Let the total money be 10 units. Transport = 1/10 = 1 unit. Remaining = 9 units.",
  "Food = 1/3 of 9 = 3 units. Money left = 9 - 3 = 6 units. Fraction left = 6/10 = 3/5.",
  "Bob had 3/5 of his money left. Answer: 3/5 (option B)."
]