conversations.from: human
conversations.value: James replaces the coffee for the household.  There are 3 other people in the house and everyone drinks 2 cups of coffee a day.  It takes .5 ounces of coffee per cup of coffee.  If coffee costs $1.25 an ounce, how much does he spend on coffee a week?
conversations.from: assistant
conversations.value: There are 3+1=4 people in the house
  So they drink 4*2=8 cups of coffee a day
  That means they use 8*.5=4 ounces of coffee a day
  So they use 4*7=28 ounces of coffee a week
  So he spends 28*1.25=$35