conversations.from: human
conversations.value: I'm completely lost with this math problem: Samson is going to another town which is 140 km away. He will use his car that uses ten liters of gasoline for a distance of 70 km. How many liters of gasoline will Samson need for a one-way trip?
  Can you give me a hand?
conversations.from: assistant
conversations.value: Samson will need 140 km/70 km = 2 ten liters of gasoline for a one-way trip to a town.
  Therefore, he will need a total of 2 x 10 liters = 20 liters of gasoline.