conversations.from: human
conversations.value: Donna bought 3 times as many pencils as Marcia did. Marcia bought double the number of pencils as Cindi did. How many pencils did Donna and Marcia buy altogether if Cindi spent $30 on $0.50 pencils?
conversations.from: assistant
conversations.value: Cindi bought 30/0.50 = 60 pencils.
  Marcia bought 2*60 = 120 pencils.
  Donna bought 3*120 = 360 pencils.
  Altogether, Donna and Marcia bought 120+360 = 480 pencils.