conversations.from: human
conversations.value: I'm stuck on this math problem: Mary has 400 sheep on her farm. She gave a quarter of her sheep to her sister, and half of the remaining sheep to her brother. How many sheep remain with Mary?
  Can you help?
conversations.from: assistant
conversations.value: Mary gives 1/4 * 400 = 100 sheep to her sister.
  She now has 400 - 100 = 300 sheep remaining.
  She then gives 1/2 * 300 = 150 sheep to her brother.
  So 300 - 150 = 150 sheep remain.