conversations.from: human
conversations.value: Can you walk me through the solution of: Brenda bakes 20 cakes a day. She does this for 9 days and then sells half of the cakes. How many cakes are left with Brenda?
conversations.from: assistant
conversations.value: After 9 days, Brenda bakes 20 * 9 = 180 cakes.
  After she sells half of them, the remaining will be 180 / 2 = 90 cakes.