An alloy of copper and zinc contains copper and zinc in the ratio 3 : 5. Another alloy of copper and zinc contains copper and zinc in the ratio 6 : 2. In what ratio should the two alloys be mixed so that the resultant alloy contains equal proportions of copper and zinc? Choose the most appropriate option.
A) 1:2  B) 2:2  C) 2:5  D) 2:6  E) 2:7
Let Alloy_1 be x units, and let Alloy_2 be y units.   So, fraction of copper in Alloy_1 = 3x/8, and fraction of zinc in Alloy_1 = 5x/8.   Similarly, fraction of copper in Alloy_2 = 6y/8, and fraction of zinc in Alloy_2 = 2y/8.   Mixing them, we get   copper = 3x/8 +6y/8; zinc = 5x/8 + 2y/8.   So, 3x+6y = 5x+2y   -&gt; 2x = 4y   -&gt; x/y = 2/4 = 1/2   So, they must be mixed in the ratio 1 : 2   1:2nswer : 1:2
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An alloy of copper and zinc contains copper and zinc in the ratio 3 : 5. Another alloy of copper and zinc contains copper and zinc in the ratio 6 : 2. In what ratio should the two alloys be mixed so that the resultant alloy contains equal proportions of copper and zinc?