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SSC Quantitative Aptitude Average Question Bank Average (II)

  • question_answer
    The average of 6 numbers is 30. If the average of first four is 25 and that of last three is 35, the fourth number is

    A) 25

    B) 30

    C) 35

    D) 40

    Correct Answer: A

    Solution :

    [a] Sum of 6 numbers \[=(30\times 6)=180\] Sum of first four numbers\[=(25\times 4)=100\] Sum of last three numbers\[=(35\times 3)=105\] \[\therefore\] 4th number \[=(100+105-180)\]\[=(205-180)=25\]


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