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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-5

  • question_answer
    In an alloy, the ratio of copper and zinc is 5 : 2. If 1.250 kg of zinc is mixed in 17 kg 500 g of alloy, then the ratio of copper and zinc will be

    A)  2 : 1                

    B)  2 : 3

    C)  3 : 2                

    D)  1 : 2

    Correct Answer: A

    Solution :

    Ratio of copper and zinc = 5 : 2. Total weight of alloy = 17500 g \[\therefore \] Weight of copper \[=\frac{5}{7}\times 17500=12500\,\,g\] \[=17500-12500=5000\,\,g\] 1250 g of zinc is mixed with the alloy. \[\therefore \] Total weight of zinc\[=5000+1250=6250\,\,g\] \[\therefore \] New ratio = 12500 : 6250 = 2 : 1


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