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Railways Sample Paper RRB (Group D) Sample Test Paper-13

  • question_answer
    In a coconut grove, (x + 2) trees yield 60 nuts per year, x trees yield 120 nuts per year and \[9x-\,2)\] trees yield 180 nuts per year. If the average yield per year per tree be 100, then x is

    A)  3                    

    B)  4

    C)  5                    

    D)  6

    Correct Answer: B

    Solution :

    [b] \[\frac{(x+2)\times 60+x\times 120+(x-\,2)\times 180}{(x+2)+x+(x-\,2)}=100\] \[\Rightarrow \,\,\,\frac{360x-\,240}{3x}=100\] \[\Rightarrow \,\,\,60x=240\Rightarrow x=4\]


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