The average age of 30 student of a class is 12 years 4 month. After admission of five new student in the class the average become 11 years 9 months. One of the five new student is 8 years 7 month old. Find the average age of the remaining four new students.
1
6 years 8 month
2
9 years
3
8 years 2 month
4
9 years 6 month