Question

Two alloys A and B are made of copper and zinc only. In alloy A, copper and zinc are in the ratio 3 : 5. In alloy B, they are in the ratio 7 : 5. How many kilograms of alloy B must be mixed with 16 kg of alloy A so that the resulting alloy has 55% copper by weight?

A 77 kg
B 84 kg
C 68 kg
D 48 kg
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