conversations.from: human
conversations.value: Lisa and Peter are selling chocolate bars door to door. Lisa sold three and a half boxes of chocolate bars, and Peter sold four and a half boxes. They sold 64 chocolate bars together. How many chocolate bars are in a box?
conversations.from: assistant
conversations.value: Let B stand for the number of chocolate bars in a box.
  Lisa sold 3 1/2 * B bars.
  Peter sold 4 1/2 * B bars.
  Together, they sold 3 1/2 * B + 4 1/2 * B = 8B = 64 bars.
  Therefore, there are B = 64 / 8 = 8 chocolate bars in a box.