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Railways Sample Paper RRB (Group D) Sample Test Paper-8

  • question_answer
    The average of three consecutive odd numbers is 12 more than one third of the first of these numbers. What is the last of the three numbers?

    A)  15                   

    B)  17

    C)  19                   

    D)  Data inadequate

    Correct Answer: C

    Solution :

    [c] Let 3 consecutive odd no. be x, x+2 and x+4 ATQ \[\frac{x+x+2+x+4}{3}=12+\frac{1}{3}x\] \[\frac{3x+6}{3}-\,\frac{x}{3}=12\] \[=2x+6=36x=\frac{36-\,6}{2}=15\] Last no=15+4=19


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