conversations.from: human
conversations.value: I need help with this problem:
  Lana aims to sell 20 muffins at the bake sale. She sells 12 muffins in the morning. She sells another 4 in the afternoon. How many more muffins does Lana need to sell to hit her goal?
conversations.from: assistant
conversations.value: Lana sold 12 muffins and has to sell 20 - 12 = 8 to hit her goal before the bake sale ends.
  When she sells another 4 in the afternoon Lana has 8 - 4 = 4 muffins left to sell to meet her target.