conversations.from: human
conversations.value: At the park, Dimitri saw families riding bicycles and tricycles. Bicycles have two wheels and tricycles have three wheels.  6 adults were riding bicycles and 15 children were riding tricycles.   How many wheels did Dimitri see at the park?
  Give me a detailed solution.
conversations.from: assistant
conversations.value: Dimitri saw 2 x 6 = 12 wheels on the bicycles.
  He saw 15 x 3 = 45 wheels on the tricycles.
  He saw a total of 12 + 45 = 57 wheels.