Two-thirds of the class have brown eyes. Half of the students with brown eyes have black hair. If there are 6 students in the class with brown eyes and black hair, how many students are there in total? Let's think first. Chain of thought:
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There are 6 * 2 = 12 students with brown eyes and hair of any color. There are 12 * 3 / 2 = 18 students in total.
Therefore, the answer is 18.
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