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      Question

      The average age of 22 children and their teacher's age

      are 20 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?
      A 45 years Correct Answer Incorrect Answer
      B 42 years Correct Answer Incorrect Answer
      C 48 years Correct Answer Incorrect Answer
      D 52 years Correct Answer Incorrect Answer

      Solution

      Sum of the age of total children and teacher = 23 × 20 = 460 Sum of the age of children after excluding = 22 × 19 = 418 Teacher’s age = 460 – 418 = 42 years

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