conversations.from: human
conversations.value: Al is 25 pounds heavier than Ben. Ben is 16 pounds lighter than Carl. If Ed weighs 146 pounds and is 38 pounds lighter than Al, find the weight of Carl.
conversations.from: assistant
conversations.value: Al weighs 146 + 38 = 184 pounds.
  Ben weighs 184 - 25 = 159 pounds.
  Carl weighs 159 + 16 = 175 pounds.