Question 14
The average age of children of Class VII is 12 years and 3 months express this age in seconds.
12 years 3 months =12×365+3×30=4470 days =4470×24×60×60s=386208000 S
In a dance class of 12 student, one of them who is 15 yr old leaves the class and a new student is admitted. This change increases the average age of the class by 3 months. Then, age of the new student is