conversations.from: human
conversations.value: Will buys 15 oranges. When he gets home, he asks his 2 sons to wash as many oranges as they are years old. The oldest son is 8 years old, the youngest is half as old as the oldest. How many oranges are left unwashed?
  Find the solution.
conversations.from: assistant
conversations.value: The older son washes 8 oranges, so the younger son washes 8 / 2 = 4 oranges.
  Together they wash 8 oranges + 4 oranges =12 oranges
  There are 15 oranges - 12 oranges = 3 oranges left unwashed.