conversations.from: human
conversations.value: This math problem has got me stumped: Micheal decided to take some piano lessons. One lesson costs $30 and lasts for 1.5 hours. How much will Micheal need to pay for 18 hours of lessons?
  Can you show me the way?
conversations.from: assistant
conversations.value: One lesson lasts 1.5 hours, so 18 hours of them is 18 / 1.5 = 12 lessons.
  If one lesson costs $30, then 12 lessons cost 12 * 30 = $360.