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    Question

    The average age of (x + 1) students of a class is 20 years.

    If the 50 years old class teacher is also included then average age of the class gets increased by one year. Find x% of 250.
    A 65 Correct Answer Incorrect Answer
    B 68 Correct Answer Incorrect Answer
    C 70 Correct Answer Incorrect Answer
    D 72 Correct Answer Incorrect Answer
    E 75 Correct Answer Incorrect Answer

    Solution

    Total age of students = 20(x + 1) years
    According to question,
    [20(x + 1) + 50] = (20 + 1)(x + 1 + 1)
    20x + 20 + 50 = 21x + 42
    21x – 20x = 70 – 42
    x = 28
    So, 28% of 250 = 70

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