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Railways Quantitative Aptitude Number System and its Operations Sample Paper Number System Sample Test Paper-1

  • question_answer
    If \[\sqrt{5}=2.236,\] then the value of \[\frac{\sqrt{5}}{2}-\frac{10}{\sqrt{5}}+\sqrt{125}\] is equal to:

    A)  7.826  

    B)  8.944    

    C)  5.59                

    D)  10.062

    Correct Answer: A

    Solution :

    [a] \[\frac{\sqrt{5}}{2}-\frac{10}{\sqrt{5}}+\sqrt{125}=\frac{\sqrt{5}}{2}-\frac{10}{\sqrt{5}}+\frac{5\sqrt{5}}{1}\] \[=\frac{5-20+10\times 5}{2\sqrt{5}}=\frac{35\sqrt{5}}{10}=3.5\times 2.236=7.826\]


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