conversations.from: human
conversations.value: Mr. Alvarez spends $36 on diesel fuel each week. If the cost of diesel fuel is $3 per gallon, how many gallons of diesel fuel does Mr. Alvarez use in two weeks?
  How to solve this?
conversations.from: assistant
conversations.value: In a week, Mr. Alvarez uses $36/$3 = 12 gallons a week.
  So in two weeks, he uses 12 x 2 = 24 gallons.