NTSE Sample Paper NTSE SAT Practice Test-20

  • question_answer
    If (a +b): (b + c): (c + a) = 6 : 7 : 8 and (a+ b + e) = 14, then the value of c is

    A) 6

    B)                                7

    C) 8                                 

    D) 14

    Correct Answer: A

    Solution :

    [a] \[\frac{a+2}{6}=\frac{b+c}{7}=\frac{c+a}{8}\] \[=\frac{a+b+b+c+c+a}{6+7+8}=\frac{2(a+b+c)}{21}=\frac{2}{21}\] \[\times 14=\frac{4}{3}\] \[\therefore \,\,\frac{a+b}{6}=\frac{4}{3}\,\,or\,=\frac{14-c}{6}=\frac{4}{3}\] \[\therefore \,\,14-c=8\,or\,\,c=6\].


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