To an alloy weighing 600 grams and containing 20% copper, 40 grams of copper was added.
| December 15, 2020 | education
To an alloy weighing 600 grams and containing 20% copper, 40 grams of copper was added. What was the percentage of copper in the new alloy?
600 grams of the alloy contains 20% copper. Therefore, the mass of copper = 600 * 0.2 = 120 grams
After 40 grams of copper is added to the alloy, both the mass of the alloy and the mass of copper in the alloy will increase.
Copper weight in alloy = 120 + 40 = 160 grams
Alloy weight = 600 + 40 = 640 grams
The percentage of copper in the new alloy = 160/640 = 0.25%
Answer: 0.25%
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