The average age of 30 students is 9 years. If the age of their teacher is included, it becomes 10 years. The age of the teacher (in years) is:

  • Option 1)

    30

  • Option 2)

      31                            

  • Option 3)

    35              

  • Option 4)

    40

  • Option 5)

    27                             

Answers (1)
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