[
  "Draw a bar for the money. Wife takes 1/3, leaving 2/3. Food: 2/5 of remainder = 2/5 x 2/3 = 4/15.",
  "After food: 2/3 - 4/15 = 2/5. Transport: 1/4 x 2/5 = 1/10. Money left: 2/5 - 1/10 = 3/10.",
  "3/10 of the original money was left. Answer: 3/10."
]