conversations.from: human
conversations.value: Yesterday, Vincent bought fifteen packs of stickers. Today, he bought ten more packs of stickers than yesterday. How many packs of stickers does Vincent have altogether?
conversations.from: assistant
conversations.value: Today, Vincent bought 15 + 10 = 25 packs of stickers.
  Therefore, Vincent has 15 + 25= 40 packs of stickers.