What will be The Age of 15th Student? If

The average age of 15 students in a class is 15 years. Among this the average age of 5 students is 14 years and the average age of 9 other student is 16 years.  The age of the 15th student is

  1. 107/7 years
  2. 15 years
  3. 14 years
  4. 11 years
Monis Rasool Professor Asked on 15th September 2015 in Maths.
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  • 1 Answer(s)

    Answer:  (4) 11 years

    Explanation:-
    The average age of 15 students = 15 years
    Then, the sum of age of 15 students = 15 x 15 = 225 years

    The average of 9 students = 16 years
    Then, the sum of the age of 9 students = 16 x 9 = 144 years

    The average age of 5 students = 14 years
    Then, the sum of the age of 5 students = 14 x 5 = 70 years

    Then, the age of 15th student = 225 – (144 + 70)
    = 225 – 214
    = 11 years

    Hence, the answer is (4) 11 years.

    Anurag Mishra Professor Answered on 15th September 2015.
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