conversations.from: human
conversations.value: Sun City has 1000 more than twice as many people as Roseville City. Roseville city has 500 less than thrice as many people as Willowdale city. If Willowdale city has 2000 people, how many people live in Sun City?
  Work out the solution step by step.
conversations.from: assistant
conversations.value: Roseville city has 3*2000-500=5500 people.
  Sun City has 2*5500+1000=12000 people.