[
  "Work backwards from the 36 packets left. Since 3/4 of the remainder was sold in the afternoon, the 36 left is 1/4 of the remainder after morning.",
  "Remainder after morning = 36 x 4 = 144. This 144 is 3/5 of the total (since 2/5 was sold in the morning).",
  "Total cooked = 144 / 3 x 5 = 240. Answer: 240 (option B)."
]