conversations.from: human
conversations.value: The half-hour newscast includes 12 minutes of national news, 5 minutes of international news, 5 minutes of sports, and 2 minutes of weather forecasts. The rest is advertisements. How many minutes of advertising are in the newscast?
  Give me a detailed solution.
conversations.from: assistant
conversations.value: 12+5+5+2=24 minutes are accounted for.
  There are 30-24=6 minutes of ads.