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    Question

    The average of 8 numbers is 21. When a new number is

    added, the average becomes 23. Find the new number.
    A 22 Correct Answer Incorrect Answer
    B 39 Correct Answer Incorrect Answer
    C 33 Correct Answer Incorrect Answer
    D 28 Correct Answer Incorrect Answer

    Solution

    Sum of 8 numbers = 8 ├Ч 21 = 168 Let new number be x. Now there are 9 numbers with average 23: (168 + x)/9 = 23 168 + x = 23 ├Ч 9 = 207 x = 207 тИТ 168 = 39 Answer: The new number is 39.

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