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    Question

    The average age of 18 children and their teacher's age

    are 15 years. If the teacher's age is excluded, the average reduces by 2. 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

    Solution

    Sum of the age of total children = 19 ×15 = 285 Sum of the age of children after excluding teacher = 18 ×13 = 234 Teacher’s age = 285 – 234 = 51 years

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