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= <<81/3=27>>27 chips in a batch.
Thus, there are 27 / 9 = <<27/9=3>>3 cookies in a batch.
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