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NTSE Sample Paper NTSE SAT Practice Test-14

  • question_answer
    Which of the following will come in place of both the question marks in the following equation? \[\frac{\left( 128\div 16 \right)\times ?-7\times 2}{{{7}^{2}}-8\times 6+{{?}^{2}}}=1\]

    A) 3             

    B) 14       

    C) 16                                

    D) 17       

    Correct Answer: A

    Solution :

    [a] \[\frac{(128\div 16)\times x-7\times 2}{49-8\times 6+{{x}^{2}}}=1\] \[\Rightarrow \,\,8x-14=49-48+{{x}^{2}}\] \[\Rightarrow \,\,{{x}^{2}}-8x+15=0\] which is time for x = 3.    


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