Home / Arithmetic Aptitude / Ratio and Proportion :: Discussion

Discussion :: Ratio and Proportion

  1. The ratio of copper and zinc in a 63 kg alloy is 4: 3. Some amount of copper is extracted from the alloy, and the ratio becomes 10: 9. How much copper is extracted?

  2. A.
    8kg
    B.
    6kg
    C.
    12kg
    D.
    10kg

    View Answer

    Workspace

    Answer : Option B

    Explanation :

    Amount of copper in alloy = [copper ratio/ sum of ratios]* total quantity of alloy

    Copper = {4/7}* 63 = 36 kg
    Similarly, the amount of zinc in alloy = [3/7] * 63 = 27 kg
    Let the extracted copper from alloy = x kg
    Remaining copper in alloy = 36-x
    The new ratio = 10: 9
    i.e., 36-x: 27 = 10: 9
    36-x: 3 = 10: 1
    36-x = 10* 3
    36-x = 30
    x = 36-30 = 6 kg.
    Hence, the extracted amount of copper is 6 kg.


Be The First To Comment