Multiple choice

10 years ago the average age of all the 25 teachers of the Girls college was 45 years. 4 years ago, the principal has retired from her post at the age of 60 years. So after one year a new principal whose age was 54 years recruited from outside. The present average age of all the teachers is, if principal is also considered as a teacher:

  1. 54 years

  2. 55 years

  3. 49 years

  4. can't determine

  5. None of these
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