conversations.from: human
conversations.value: There are 100 people in a theater. If 19 of these people have blue eyes, half of them have brown eyes, a quarter have black eyes, and the rest have green eyes, how many of them have green eyes?
  Solve it.
conversations.from: assistant
conversations.value: 100/2 = 50 people in the theater have brown eyes.
  100/4 = 25 people in the theater have black eyes.
  There are 50+25+19 = 94 people in the theater with either brown, black, or blue eyes.
  There are 100-94 = 6 people in the theater with green eyes.