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NTSE Sample Paper NTSE SAT Practice Test-13

  • question_answer
    The average of 2,7,6 and is 5 and the verage of 18, l,6,x and y 'is 10. What is the value of \[\sqrt{xy}\]

    A) 20

    B) 15

    C) 10    

    D) 8

    Correct Answer: C

    Solution :

    [c] \[\left( 2+7+6+x \right)=4\times 5\Rightarrow \text{ }x=5\] Also, \[\left( 18+1+6+5+y \right)=\text{ }5\times 10\Rightarrow y=20.\] \[\therefore \sqrt{xy}=\sqrt{5\times 20}=\sqrt{100}=10.\]                         


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