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    Question

    Average age of a class of 28 students is 10

    years. Average age of the class is increased by 12 months if the age of the teacher is included. Find the age of the teacher.
    A 39 years Correct Answer Incorrect Answer
    B 69 years Correct Answer Incorrect Answer
    C 78 years Correct Answer Incorrect Answer
    D 80 years Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Sum of the ages of all the students in the class = 28 × 10 = 280 years
    Sum of the ages of the students along with teacher = 29 × 11 = 319 years
    So the age of the teacher = 319 – 280 = 39 years

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