Question

    The average of the first 6 numbers is 'x+40', the

    average of the next 8 numbers is 'x', and the average of the remaining 6 numbers is 'x−10'. If the average of all the numbers is 70, find the value of 'x'.
    A 61 Correct Answer Incorrect Answer
    B 68 Correct Answer Incorrect Answer
    C 53 Correct Answer Incorrect Answer
    D 55 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, 6(x+40)+8x+6(x−10)=70×20 6x+240+8x+6x−60=1400 20x+180=1400 20x=1220 x=61

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