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    Question

    Average age of a class of 37 students is 12

    years. Average age of the class is increased by 18 months if the age of the teacher is included. Find the age of the teacher.
    A 65 years Correct Answer Incorrect Answer
    B 69 years Correct Answer Incorrect Answer
    C 70 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 = 37 × 12 = 444 years
    Sum of the ages of the students along with teacher = 38 × 13.5 = 513 years
    So the age of the teacher = 513 – 444 = 69 years

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