Ali surveyed 200 students at a school and recorded the eye color and the gender of each student. Of the 80 male students who were surveyed, 60 had brown eyes. If eye color and gender are independent, how many female students surveyed would be expected to have brown eyes?

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Since eye color is independent to gender, the percentage of male students having brown eyes is equal to the percentage of female students having brown eyes.

The probability of having brown eyes is

$$\frac{60}{80} = \frac{3}{4} = 75$$

The number of female students is

$$200-80 =120$$

75% of these students will have brown eye color

$$120 \cdot 0.75 = \boxed{90}$$