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    Question

    The average age of 15 children and their teacher's age

    are 12 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
    E 55 years Correct Answer Incorrect Answer

    Solution

    Sum of the age of total children = 16 ×12 = 192 Sum of the age of children after excluding teacher = 15 ×10 = 150 Teacher’s age = 192 – 150 = 42 years

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