The average age of a family of five members is 28. If the present age of the youngest member is 8 yr, what was the average age of the family at the time of the birth of the youngest member?
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There are 5 members.
Total ages of five member=5×28=140
Age of youngest member=8
8 years ago the ages of 4member= 140-(8×5)=100
Now,
The average ages of 4 member at the birth of youngest =100÷4=25.
Total ages of five member=5×28=140
Age of youngest member=8
8 years ago the ages of 4member= 140-(8×5)=100
Now,
The average ages of 4 member at the birth of youngest =100÷4=25.
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