conversations.from: human
conversations.value: At a school, 40% of the students receive a free lunch. These lunches are paid for by making sure the price paid by the paying students is enough to cover everyone's meal. If it costs $210 to feed 50 students, how much do the paying students pay for lunch?
  Solve it.
conversations.from: assistant
conversations.value: 60% of the students pay for the lunch because 100 - 40 = 60
  30 students pay for lunch because 50 x .6 = 30
  These students pay $7 for their lunch because 210 / 30 =7