conversations.from: human
conversations.value: Can you explain how to solve this math problem: Kate wants to buy a special pen as a gift for her friend. The pen costs $30, and Kate only has money for a third of that amount. How much more money does she need to buy the pen?
conversations.from: assistant
conversations.value: Currently, Kate has only 1/3 * 30 = $10.
  That means Kate needs 30 - 10 = $20 more to buy the pen.