-
The average age of 45 students in a class in 13 yr, 15 new students with an average age of 18 yr join the class. What is the average age of all the students in the class?
-
- 13.15 yr
- 14.25 yr
- 12.28 yr
- 16.42 yr
Correct Option: B
Sum of the age of 45 students = 45 x 13 = 585 yr
Sum of the age of 15 students = 15 x18 = 270 yr
Sum of the age of all students = sum of the age of 45 students + sum of the age of 15 students
= 585 yr + 270 yr
=855 yr
∴ Average age of all students = 855 ⁄ 60
= 14.25 yr