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Two years ago the mean age of 40 people was 11 years .now a person left the group and the mean age is changed to 12 years .find the age of the person who

left the group


let the man's age be x
Hence sum of their age now =40*11 +40*2=520
After the man has left- sum of age= 39*12=468
 From the question
                             ⇒  x= 52
  Age of person is 52
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