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      Question

      The average age of 12 students is 15 years. If the age

      of the teacher is also included, the average increases by 1 year. Find the teacher's age.
      A 18 yrs Correct Answer Incorrect Answer
      B 20 yrs Correct Answer Incorrect Answer
      C 28 yrs Correct Answer Incorrect Answer
      D 44 yrs Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ, Total age of 12 students = 12 x 15 = 180 Now 13 persons have average age 16 Total age = 13 x 16 = 208 Teacher's age = 208 - 180 = 28 years

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