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      Question

      The average age of 18 children and their teacher's age

      are 15 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

      Solution

      Sum of the age of total children = 19 × 15 = 285 Sum of the age of children after excluding teacher = 18 × 13 = 234 Teacher’s age = 285 – 234 = 51 years

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