The average age of 40 students of a class is 15 years. When

Home » Aptitude » Average » Question

The average age of 40 students of a class is 15 years. When 10 new students are admitted, the average is increased by 0.2 year. The average age of the new students is :

1. 15.2 years
2. 16 years
3. 16.2 years
4. 16.4 years

Correct Option: B

Here , Total age of 40 old students = 40 × 15 = 600 years.
Total age of 40 old and 10 new students = 50 × 15.2 = 760 years
∴ Total age of 10 new students = 760 – 600 = 160 years.
∴ Required average age = 160 ÷ 10
Required average age = 16 years.