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Railways R.R.C. (Hajipur) Solved Paper Held on 1st Shift 30-11-2014

  • question_answer
    The average of marks scored by the students of a class is 68. The average of marks of the girls in the class is 80 and that of boys is 60. What is the percentage of boys in the class?

    A) 40%                             

    B) 55%

    C) 60%                             

    D) 70%

    Correct Answer: C

    Solution :

    Suppose the number of boys and girls in the class x and y respectively. Then,    \[80y+60x=68\,\,(x+y)\]             \[x:y=3:2\]  Hence, the percentage of boys in the class \[=\frac{3}{5}\times 100=60%\]


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