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Alloys A and B contain copper and zinc. In alloy A percentage of copper is 25% and in alloy B ratio of copper and zinc is 3 ∶ 5. In what ratio of A and B to be mixed to get a new alloy containing copper and zinc in the ratio 1 ∶ 2?

Alloys A and B contain copper and zinc. In alloy A percentage of copper is 25% and in alloy B ratio of copper and zinc is 3 ∶ 5. In what ratio of A and B to be mixed to get a new alloy containing copper and zinc in the ratio 1 ∶ 2? Correct Answer 1 ∶ 2

In alloy A percentage of copper is 25%, so we can say the ratio of copper to zinc in alloy = 1 ∶ 3

In alloy B ratio of copper to zinc = 3 ∶ 5

Using allegation method

Alloy (A)        Alloy (B)

    1/4              3/8

              1/3

   1/24      ∶      1/12

⇒ Required ratio = 1/24 ∶ 1/12 = 1 ∶ 2

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