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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?
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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?

User David Faber
by
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1 Answer

1 vote

Answer:

24

Explanation:

First: 12*10=120

Then: 12*12=144

=> Ms. Xu's old: 144-120=24

User Onaracs
by
3.9k points
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