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    Question

    The average of 10 numbers is 102. The average of the

    first 5 numbers is 78 and the average of the last 4 numbers is 46. What is the 6th number?
    A 530 Correct Answer Incorrect Answer
    B 690 Correct Answer Incorrect Answer
    C 446 Correct Answer Incorrect Answer
    D 703 Correct Answer Incorrect Answer

    Solution

    Total sum of 10 numbers = 10 × 102 = 1020 Sum of first 5 numbers = 5 × 78 = 390 Sum of last 4 numbers = 4 × 46 = 184  According to question, => 1020 – (390 + 184) = 446

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