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SSC Sample Paper Mock Test-3 SSC CGL Tear-II Paper-1

  • question_answer
                 Zinc and copper are in the ratio of 5 : 3 in 200 g of an alloy. How much grams of copper be added to make the ratio as 3 : 5?     

    A)  \[133\frac{1}{3}\]

    B)  \[\frac{1}{200}\]                    

    C)  72                               

    D)  66     

    Correct Answer: A

    Solution :

    Weight of \[=200\times \frac{5}{8}=125\,\,g\] Weight of copper \[=200\times \frac{3}{8}=75\,\,g\] Let the ratio of 125 g zinc and x gram copper be 3 : 5 \[\therefore \]      \[\frac{125}{x}=\frac{3}{5}\] \[\therefore \]      \[x=\frac{125\times 5}{3}=\frac{625}{3}\,\,g\] \[\therefore \]Addition of copper in mixture \[=\frac{625}{3}-75=\frac{625-225}{3}=\frac{400}{3}=133\frac{1}{3}\,\,g\]                        


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