graftonbbrackett graftonbbrackett

17-06-2021
Mathematics

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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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marcustrinh11 marcustrinh11

17-06-2021

Answer:

24

Step-by-step explanation:

First: 12*10=120

Then: 12*12=144

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

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