Two years ago the mean age of 40 people was 11 years.Now a person left the group and the mean age has changed to 12 years.Find the age of the person who left the group.
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Explanation:
Total age of 40 people=40×11=440 years
Total age of 39 people=39×12=468 years
The age of the person who left the group=468-440=28 years.
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