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To find out how many cookies Miss Gonzalez baked, we need to add the number of cookies that were eaten to the number of cookies that were left.
Let's use the given information: after 12 students each ate a cookie, there were six cookies left. We know that initially there were 12 + 6 = 18 cookies (12 cookies eaten + 6 cookies left).
Therefore, Miss Gonzalez baked 18 cookies for her class.