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    Question

    Section 4

    The average age of 24 children and their teacher's age

    are 21 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 58 years Correct Answer Incorrect Answer
    D 52 years Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Sum of the age of total children and teacher = 25 × 21 = 525 Sum of the age of children after excluding = 24 × 20 = 480 Teacher’s age = 525 – 480 = 45 years

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