conversations.from: human
conversations.value: Find the answer to this math problem: Carl has been selling watermelons on the side of the road for $3 each. This evening he went home with $105 in profit and 18 watermelons. How many watermelons did he start out with this morning?
conversations.from: assistant
conversations.value: Carl sells his watermelons for $3 each so today he sold $105 / $3 per watermelon = 35 watermelons.
  He had 18 watermelons left over, so this morning he started with 18 + 35 = 53 watermelons.