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Railways Sample Paper RRB (Group D) Sample Test Paper-5

  • question_answer
    The annual examination Mahuya got 10% less marks than Supriyo in Mathematics. Mahuya got 81 marks. The marks of Supriyoare

    A)  89                   

    B)  90

    C)  87                   

    D)  88

    Correct Answer: B

    Solution :

    [b] Marks of Supriyo \[=x\] marks Acceding to question Mahuya marks = Supriyo marks \[-\,10%\] of Supriyo marks \[81=x-10%\,\,of\,\,x\Rightarrow x\left( 1-\frac{10}{100} \right)\] \[81=\frac{9}{10}x\,\Rightarrow \,\,\,\frac{810}{9}=\,x\] \[\therefore \,x=90\,marks\]


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