Multiple Choice Questions on Of the three numbers the average of the first and the second is greater than the average of the seco........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

Of the three numbers the average of the first and the second is greater than the average of the seco...........

Quantitative Aptitude ( CCS) Average
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    Of the three numbers, the average of the first and the second is greater than the average of the second and the third by 15. What is the difference between the first and the third of the three numbers?

    15

    Incorrect Answer

    45

    Incorrect Answer

    60

    Incorrect Answer

    30

    Correct Answer
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    Explanation:

    Let the three numbers be x,y and z,
    then (x + y)/2 - (y + z)/2 = 15
    = ( x + y – y – z)/2 = 15
    = x – z = 30

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