conversations.from: human
conversations.value: There was some money in the cookie jar. Doris spent $6 from the cookie jar. Martha spent half as much as Doris. If there were $15 left in the cookie jar, how much money, in dollars, was there in the cookie jar at first?
  Give me a detailed solution.
conversations.from: assistant
conversations.value: Martha spent 6/2=3 dollars.
  Martha and Doris spent 6+3=9 dollars.
  There were 15+9=24 dollars in the cookie jar at first.