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

  • question_answer
    What is the missing figure in the expression given below? \[\frac{16}{1}\times \frac{16}{7}-\frac{*}{7}\times \frac{9}{7}+\frac{9}{7}\times \frac{9}{7}=1\]

    A)  1        

    B)  7         

    C)  4.57                

    D)  32

    Correct Answer: D

    Solution :

    [d] Let the missing figure in the expression be x. \[\frac{16}{7}\times \frac{16}{7}-\frac{x}{7}\times \frac{9}{7}+\frac{9}{7}\times \frac{9}{7}=1\] \[\Rightarrow 16\times 16-9x+9\times 9=7\times 7\] \[\Rightarrow 9x=16\times 16+9\times 9-7\times 7=256+81-49=288\]\[\Rightarrow x=\frac{288}{9}=32\]


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