Question

Choose the correct answer from the alternative given.
The average age of 15 students of a class is 15 years Out of these the average age of 5 students is 14 years and that of the other 9 students is 16 years. The age of the 15th student is:

• A. 11 years
• B. 4 years
• C. 15 years
• D. 14 years

Answer 1

The correct option is A 11 years

Total age of 15 students 15 $\times$ 15 225 years.
Total age of 5 students = 5 $\times$ 14 = 70 years
Total age of other 9 students = 9 $\times$ 16 144 years
Age of 15th student 225 (70 + 144) =225234= 11 years.
Hence, the age of 15th student is 11 years.