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### Question Asked by a Student from EXXAMM.com Team

** 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:

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