conversations.from: human
conversations.value: At the circus, the clown has 3 dozen balloons on a string in his hand.  3 boys and 12 girls buy a balloon each.  How many balloons is the clown still holding?
  Work out the solution step by step.
conversations.from: assistant
conversations.value: The clown is holding 3 x 12 = 36 balloons.
  This many children buy a balloon: 3 + 12 = 15 kids.
  After the children buy the balloons, the clown is holding this many in his hand 36 - 15 = 21 balloons.