conversations.from: human
conversations.value: At a convention, 16 of 36 delegates arrived with pre-printed name badges. Half of the remaining delegates made their own, hand-written name badges. How many delegates were not wearing name badges?
  How to solve this?
conversations.from: assistant
conversations.value: There were 36-16=20 without pre-printed name badges.
  Then 20/2=10 made hand-written badges
  There were 20-10=10 with no name badge.