# How much copper should be mixed with 63kg of zinc in order to make an alloy containing 45% zinc and 55% copper the full format to solve it step by step

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So 45% of total weight = 63kg

100% of alloy = 63*(100/45) = 140kg

mass of copper to be added = 140 - 63 = 77kg

So you need to add 77kg of copper