Exam Maths Puzzle Numerical Ability Alligation or Mixture

An alloy of zinc and copper contains the metals in the ratio 5 : 3. The quantity of zinc to be added to
16 kg of the alloy so that the ratio of the metal may be 3 : 1 is

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8 Kg.

In 16 Kg. of alloy, weight of Zinc =16*5/8=10 kg and Copper 16*3/8=6 kg.
Let 'x' kg. of Zinc is be added to make ratio of Zinc and Copper 3:1, then
(10+x)/6 =3/1
x=8
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