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In a classroom, the combined average age of all students and their teacher is 17 years. The average age of the boys in the class is 13 years. If the teacher's age is 23 years more than the average age of the girls, and the number of boys is equal to the number of girls, what is the average age of the girls?

A 15 years

B 17 years

C 19 years

D 16 years

E Cannot be determined

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