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Question

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

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Solution

Two years ago the mean age for 40 people was 11 years.
Total age of 40 people two years ago =40×11=440
Now, after two years the total age should go up =(2×40)+440=80+440=520.
When one person left, the for 39 people the mean age is 12.
Total age of 39 people =39×12=468
Required age =520468=52years

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