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    5. The average age of 22 children and their teacher's age are 20 years. If the teacher's age is exclude

    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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