[
  "Draw a bar model: the number of oranges does not change. Only apples are sold.",
  "At first: Apples = 6u, Oranges = 5u. After: (6u - 30) : 5u = 7 : 10. Cross-multiply: 10(6u - 30) = 7(5u). 60u - 300 = 35u. 25u = 300, u = 12.",
  "Total at first = 6x12 + 5x12 = 72 + 60 = 132 apples and oranges."
]