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    Question

    The average age of 35 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 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
    E 55 years Correct Answer Incorrect Answer

    Solution

    Sum of the age of total children = 36 × 20 = 720 Sum of the age of children after excluding teacher = 35 × 19 = 665 Teacher’s age = 720 – 665 = 55 years

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