conversations.from: human
conversations.value: Toms car gets 50 miles to the gallon.  He drives 75 miles per day.  If gas is $3 per gallon how much does he spend on gas in 10 days?
conversations.from: assistant
conversations.value: He drives 75*10=750 miles
  So he uses 750/50=15 gallons
  That means he spends 15*3=$45 on gas