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Q:

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

  • 1
    34 years
  • 2
    36 years
  • 3
    37 years
  • 4
    40 years
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Answer : 4. "40 years"

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