SOLUTION: the mean age of 10 people is 15. When another person joins the group, the mean age goes down to 14. How old os the new person?

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Question 984871: the mean age of 10 people is 15. When another person joins the group, the mean age goes down to 14. How old os the new person?
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


If the mean age of 10 people is 15, then the sum of their ages must be 150. What is the sum of the ages of 11 people with a mean age of 14? The difference in the sums is the age of the person who joined the group.

John

My calculator said it, I believe it, that settles it