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Railways R.R.C. (Patna) Solved Paper Held on 1st_Shift 23-11-2014

  • question_answer
    A and B are two alloys of Gold and Copper prepared by mixing these metals in the proportion 7: 2 and 7:1 respectively. If equal quantities of alloy are melted to form a third alloy C, the proportion of Gold and Copper in C will be?

    A) 5 : 9                 

    B)   5 : 7

    C) 7 : 5                             

    D) 14 : 13

    Correct Answer: C

    Solution :

    The proportion of Gold and Copper in C will be \[=\left( \frac{7}{9}+\frac{7}{18} \right)\,\,:\,\,\left( \frac{2}{9}+\frac{11}{18} \right)\] \[=\left( \frac{21}{18} \right)\,\,:\,\,\left( \frac{15}{18} \right)\] \[=7:5\]


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