conversations.from: human
conversations.value: Matt can make a batch of a dozen cookies using 2 pounds of flour.  He uses 4 bags of flour each weighing 5 pounds.  If Jim eats 15 cookies how many cookies are left?
conversations.from: assistant
conversations.value: Matt used 4*5=20 pounds of flour
  That means he made 20/2=10 batches
  So he cooked 10*12=120 cookies
  After Jim eats 15 there are 120-15=105 cookies left