conversations.from: human
conversations.value: Find the answer to the math problem: Lovely cuts her birthday cake into 12 equal pieces. Only one-fourth of the cake was eaten by her visitors and the rest were kept. How many slices of cake were kept?
conversations.from: assistant
conversations.value: 12/4 = 3 slices of cake were eaten by Lovely's visitors.
  So, 12 - 3 = 9 slices of cake were kept.