conversations.from: human
conversations.value: Solve the math problem: Dana has 15 more pencils than Jayden, who has twice as much as Marcus. How many more pencils does Dana have than Marcus, if Jayden has 20 pencils?
conversations.from: assistant
conversations.value: Dana has 15 more pencils than Jayden who has 20, so Dana has 20+15 = 35 pencils
  Jayden has 20 pencils which is twice as much as Marcus's so Marcus has 20/2 = 10 pencils
  Dana has 35-10 = 25 more pencils than Marcus