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    Question

    A college group of 50 students has an average age of 23

    years. 10 new students are added and the average age decreases to 21. What is the average age of the new students?
    A 9 years Correct Answer Incorrect Answer
    B 10 years Correct Answer Incorrect Answer
    C 11 years Correct Answer Incorrect Answer
    D 12 years Correct Answer Incorrect Answer

    Solution

    Initial sum = 50 × 23 = 1150 years
    New total = 60
    New average = 21
    New total sum = 60 × 21 = 1260 years
    Sum of new = 1260 - 1150 = 110 years
    Average = 110 ÷ 10 = 11 years

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