Mathematics, 30.03.2021 22:00 imhorribleatmath90

The mean age of the first 7 people to arrive at Grandma Bertha’s birthday party was 21. When Jeff arrived at the party, the mean increased to 22. Mary, who is 27, arrived next. The tenth and final person to arrive was Grandma Bertha, and the mean age increased to 28 years. How old is Grandma Bertha on this birthday?

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