conversations.from: human
conversations.value: Daphney buys 5 kg of potatoes at the supermarket. If 2 kg of potatoes costs $6, how much will she pay?
  Solve it.
conversations.from: assistant
conversations.value: The price per kilogram of potatoes is $6 / 2 = $3.
  To buy 5 kg of potatoes, she will have to pay 5 * $3 = $15.