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Railways Sample Paper RRB (Group D) Sample Test Paper-6

  • question_answer
    DIRECTION: Select the missing number/letter from the given responses. \[\begin{matrix}    7 & 6 & 15  \\    10 & ? & 12  \\    35 & 12 & 90  \\ \end{matrix}\]

    A)  9        

    B)  4

    C)  25                   

    D)  11

    Correct Answer: B

    Solution :

    [b] \[7\times (10\div 2)=35\] \[15\times (12\div 2)=90\] Similarly, \[6\times (x\div 2)=12\] \[\Rightarrow \,\,\,6\times \frac{x}{2}=12\] \[\Rightarrow \,\,\,3x=12\] \[\therefore \,\,\,x=12\div 3=4\]


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