100% copper-zinc alloy copper is 45%. How many kg of zinc should be added to the alloy so that the amount of copper is 20%?
Let’s find out how many kg to add zinc so that the amount of copper becomes 20%.
100 – 45 = 55% zinc is in the alloy.
55:45 = 1.22 kg (approx) zinc.
1.22 * 20 = 24.4 kg of zinc must be added to the alloy.
Answer: 24.4 kg of zinc must be added to the alloy to make the copper 20%.
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