conversations.from: human
conversations.value: Jeff is collecting matchbox cars. He has twice as many cars as trucks. He has 60 total vehicles. How many trucks does he have?
  How to solve this?
conversations.from: assistant
conversations.value: The number of trucks + 2(number of trucks) = 60
  Therefore 3(number of trucks) = 60
  Number of trucks = 20 because 60 / 3 = 20