Give the step-by-step reasoning process and then the final answer. Harry uses a whole bag of chocolate chips when he makes dough for chocolate chip cookies. The dough makes three batches of cookies, and each cookie has nine chocolate chips in it. A bag of chocolate chips has 81 chips in it. How many cookies are in a batch?
There are 81 / 3 = 27 chips in a batch. Thus, there are 27 / 9 = 3 cookies in a batch.
The final answer: 3.