conversations.from: human
conversations.value: At the supermarket, the price paid for oranges is proportional to the mass purchased. Annie paid $6 for 2 kg of oranges. How much will Annie pay for 12 kg of oranges?
  Solve this problem.
conversations.from: assistant
conversations.value: The price of 1 kg of oranges is $6 / 2 kg = $3/kg
  So Ali will pay 12 kg * $3/kg = $36 for 12 kg of oranges.