10 years ago the average age of all 25 teachers of the Boy’s college was 45 years. 4 years ago, the principal

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Q 2217223180.     10 years ago the average age of all 25 teachers of the Boy’s college was 45 years. 4 years ago, the principal has retired from his post at the age of 60 years. So after one year a new principal whose age was 54  years was recruited from outside. The present average age of all the teachers is, if principal is also considered as a teacher:
IBPS-PO 2017 Mock Mains
A

54 (18)/(25) yeaars

B

55 (17)/(25) years

C

49 (1/2) years

D

54 (17)/(25) years

E

None of these

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