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      Question

      The average age of 15 children and their teacher's age

      are 12 years. If the teacher's age is excluded, the average reduces by 2. What is the teacher's age?
      A 49 years Correct Answer Incorrect Answer
      B 42 years Correct Answer Incorrect Answer
      C 60 years Correct Answer Incorrect Answer
      D 51 years Correct Answer Incorrect Answer
      E 55 years Correct Answer Incorrect Answer

      Solution

      Sum of the age of total children = 16 × 12 = 192 Sum of the age of children after excluding teacher = 15 × 10 = 150 Teacher’s age = 192 – 150 = 42 years

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