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    Question

    The average age of (x + 7) interns is 19 years. After

    adding a 41-year-old mentor, the average rises to 20 years. Find x% of 500.
    A 50 Correct Answer Incorrect Answer
    B 95 Correct Answer Incorrect Answer
    C 70 Correct Answer Incorrect Answer
    D 65 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Total age of interns = 19(x + 7)

    According to question,

    19(x + 7) + 41 = 20(x + 7 + 1)

    19x + 133 + 41 = 20x + 160

    19x + 174 = 20x + 160

    20x – 19x = 174 – 160

    x = 14

    So, 14% of 500 = 70

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