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SSC Sample Paper SSC CGL - Sample Paper-13

  • question_answer
    Two types of alloys possess gold and silver in the ratio of 7 : 22 and 21 : 37, In what ratio should these alloys be mixed so as to have a new alloy in which gold and silver would exist in the ratio 25 : 62?

    A) 13 : 8   

    B) 8: 13

    C) 13: 12

    D) 6: 9

    Correct Answer: A

    Solution :

    Quantity of gold in 1 kg of alloy 'A' \[=\frac{7}{29}\] Quantity of gold in 1 kg of alloy 'B' \[=\frac{21}{58}\] Quality of gold in 1 kg of alloy 'C' \[=\frac{25}{87}\] \[\therefore \] Required ratio             \[=\left( \frac{21}{58}-\frac{25}{87} \right):\left( \frac{25}{87}-\frac{7}{29} \right)\]             \[=\frac{63-50}{174}:\frac{25-21}{87}\]             \[=\frac{13}{174}:\frac{4}{87}=13:8\]  


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