conversations.from: human
conversations.value: Madeline and her roommate, Keenan, share the cost of groceries. In total, they spend about $400 per month. In a four-week month, how many dollars does Keenan spend per week if Madeline pays 60% of the cost?
conversations.from: assistant
conversations.value: They spend $400/4=$100 per week.
  Keenan pays for 100-60=40% of the groceries.
  Thus, she spends $100*(40/100)=$40 per week.