Question
There are 3 members in a family. The average age of the
father and mother is 40 years. The average age of the father, mother, and daughter is 30 years. Find the age (in years) of the daughter.Solution
The average age of father and mother =40 years Total age of father and mother=40×2=80 years Now, the average age of the father, mother, and daughter =30years. Total age of the father, mother, and daughter =30×3=90years. Age of daughter =90-80=10 years.
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