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.
Add Comment
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.
Add Comment

Your Answer

By posting your answer, you agree to the privacy policy and terms of service.