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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 ├Ч 20 = 460 Sum of the age of children after excluding = 22 ├Ч 19 = 418 TeacherтАЩs age = 460 тАУ 418 = 42 years

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