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  • Question
  • The average age of 5 sisters is 20 yr. If the age of the youngest sister be 4yr. What was the average age of the group of sister at the birth of the yongest sisiter?


  • Options
  • A. 25 yr
  • B. 15 yr
  • C. 18 yr
  • D. 20 yr

  • Correct Answer
  • 20 yr 

    Explanation

    Total age of 5 sister = 20 x 5 = 100 yr.
    4 yr ago, total sum of ages
    = 100 - ( 5 x 4) = 100 - 20 = 80 yr
    But at that time (4 yr ago), there were 4 sister in the group.
    ? Average age at that time(4 yr ago) = 80/4 = 20 yr.


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    • Options
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