conversations.from: human
conversations.value: A company has 200 employees.  60% of the employees drive to work.  Of the employees who don't drive to work, half take public transportation. How many more employees drive to work than take public transportation?
conversations.from: assistant
conversations.value: Drive to work:200(.60)=120
  Don't Drive to work:200-120=80
  Public Transportation:80(.50)=40 employees
  80-40=40 employees