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Railways Quantitative Aptitude Basic Calculations Sample Paper Square Roots & Cube Roots Sample Test Paper-5

  • question_answer
    The square of a natural number when subtracted from its cube results in 48. The number is

    A)  6                    

    B)  5       

    C)  4                    

    D)  8

    Correct Answer: C

    Solution :

    [c] Let the natural number be ?x?. \[\therefore \] \[{{x}^{3}}-{{x}^{2}}=48\] \[\Rightarrow \] \[{{x}^{2}}(x-1)=48\] \[\Rightarrow \] \[{{4}^{2}}(4-1)=48\] \[\therefore \] \[x=4\]


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