2. Sample Papers
  3. SSC

SSC Sample Paper SSC CHSL (10+2) Sample Test Paper-23

  • question_answer
    A and B are two alloys of silver and gold, prepared by mixing metals in the ratio of \[4:3\] and \[5:7\] respectively. Equal quantities of these alloys are melted to form a third alloy C. The ratio of silver and gold in the alloy C is :

    A)  \[20:21\]                      

    B)  \[7:12\]

    C)  \[19:41\]                      

    D)  \[83:85\]

    Correct Answer: D

    Solution :

     Let 1 kg of each one of A and B be taken to form 2 kg of C. Silver in 1kg of \[A=\frac{4}{7}\] Gold in 1 kg of \[A=\frac{3}{7}\] Silver in 1 kg of \[B=\frac{5}{12}\] Gold in 1 kg of \[B=\frac{7}{12}\] Silver in 2 kg of \[C=\left( \frac{4}{7}+\frac{5}{12} \right)=\frac{83}{84}\] Gold in 2kg of \[C=\left( \frac{3}{7}+\frac{7}{12} \right)=\frac{85}{84}\] Ratio of silver and gold in \[C=\frac{83}{84}/\frac{85}{84}=\underline{\mathbf{83:85}}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner