conversations.from: human
conversations.value: Brian has twice as many tennis balls as Frodo, who has 8 more than Lily. If Lily has 3 tennis balls, how many does Brian have?
  Can you solve this problem?
conversations.from: assistant
conversations.value: Frodo has 8 tennis balls more than Lily (who has 3), so he has 8+3 = 11 tennis balls
  Brian has twice as many as Frodo, which makes 11*2 = 22 tennis balls.