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    Question

    There are ten numbers such that the average of the first

    three numbers is 15 and the average of the last five numbers is 22. If the average of the fourth and fifth number is 17, then find the average of all the numbers.
    A 18.9 Correct Answer Incorrect Answer
    B 27.5 Correct Answer Incorrect Answer
    C 12.5 Correct Answer Incorrect Answer
    D 35.5 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Average of all the 10 numbers = {(3 × 15) + (5 × 22) + (2 × 17)/10}

    = {(45 + 110 + 34)/10} = 189/10 = 18.9

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