The fraction of the students in Siena's class are girls with brown eyes is 5/12.
Let the fraction of students in Siena's class with brown eyes be a=5/8.
And the fraction of students in Siena's class with brown eyes are girls be b=2/3.
Then, the fraction of students in Siena's class are girls with brown eyes be z=a×b
Therefore, by substituting the fraction values, we get
z=(5/8)×(2/3)
z=5/12.
Hence, 5/8 of the students in Siena's class have brown eyes. 2/3 of the students with brown eyes are girl. Then, the fraction of students in Siena's class are girls with brown eyes is 5/12.
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