conversations.from: human
conversations.value: A club is going to get additional members so that they will have 5 more than twice their current number of their members. If the club has 10 members now, how many additional members do they need?
conversations.from: assistant
conversations.value: Twice the current number of members now is 10 * 2 = 20 members
  So, the club wants to have 20 + 5 = 25 members.
  Therefore, they need to get 25 - 10 = 15 members.