average age of a family of 5 members in 2010 is 15 . a new number is born in 2010. find the average age of family on 4th birthday of youngest member
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2
Answer:
Total ages of five member=120
Age of youngest member=8
8 years ago the ages of 4member=120-(8×5)=80
Now,
The average ages of 4 member at the birth of youngest =80÷4=20.
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3
Answer:16.5
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