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    Question

    The average age of 20 children and their teacher's age

    are 18 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?
    A 42 years Correct Answer Incorrect Answer
    B 38 years Correct Answer Incorrect Answer
    C 36 years Correct Answer Incorrect Answer
    D 29 years Correct Answer Incorrect Answer
    E 25 years Correct Answer Incorrect Answer

    Solution

    Sum of the age of total children = 21 × 18 = 378 Sum of the age of children after excluding teacher = 20 × 17 = 340 Teacher’s age = 378 – 340 = 38 years

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