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    Question

    The average age of 30 employees is 28 years. If x new

    employees join with an average age of 35 years, the overall average rises by 1 year. Find x.
    A 5 Correct Answer Incorrect Answer
    B 12 Correct Answer Incorrect Answer
    C 10 Correct Answer Incorrect Answer
    D 18 Correct Answer Incorrect Answer

    Solution

    ATQ, 30 * 28 + x * 35 = (30 + x) * (28 + 1) 840 + 35x = (30 + x) * 29 35x – 29x = 870 – 840 6x = 30 x = 5

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