conversations.from: human
conversations.value: Erica sees 9 butterflies in the garden.  She sees one-third of them fly away.  How many butterflies are left in the garden?
conversations.from: assistant
conversations.value: Erica sees 9 / 3 = 3 butterflies fly away.
  There are 9 - 3 = 6 butterflies still left in the garden.