The average age of the 12 people in a classroom is 10. After Ms. Xu walks into the room, the average age of everyone in the classroom increases to 12. How old is Ms. Xu? - QAmmunity.org

The average age of the 12 people in a classroom is 10. After Ms. Xu walks into the room, the average age of everyone in the classroom increases to 12. How old is Ms. Xu?

asked Jun 27, 2022 198k views

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