Question

15 years ago, the average age of all the 80 teachers of the college was 50 years. 8 years ago, the principal has retired from her post at the age of 60 years. So after one year from that a new principal whose age was 56 years recruited from outside. Find the present average age of all the teachers is, if principal is also considered as a teacher?

A 5417/80 years
B 5613/90 years
C 5195/80 years
D 6832/3 years
E None of these
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