# 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 15^{th} student is

- 107/7 years
- 15 years
- 14 years
- 11 years

**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 15^{th} student = 225 – (144 + 70)

= 225 – 214

= 11 years

Hence, the answer is (4) 11 years.