Quantitative Aptitude :: Averages Problems And Answers

5. Seven years ago the average age of a family of 2 members was 25 years. A child has been born. due to Which the average age of the family is 23 years today. What is the present age of the child?

A. 7 years B. 5 years
C. 3 years D. 8 years  
Answer & Explanation

Answer: Option B

Explanation:
Average of the family of two numbers
 7 years ago = 25
                   = (25+ 7) * 2 = 64 years
Average age of the family of three members at present = 23 years
                   = 23 * 3 = 69 YEARS
Age of child = 69 - 64 = 5 years  


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