Alloy P contains copper and zinc in the ratio 5 : 3 and alloy Q contains them in the ratio 3 : 1. In what ratio must P and Q be melted together to get a new alloy with copper and zinc in the ratio 7 : 3?
Correct answer C. 2:3
Explanation
Copper fractions are 5/8, 3/4 and target 7/10. P : Q = (3/4 - 7/10) : (7/10 - 5/8) = 1/20 : 3/40 = 2 : 3.
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