An 85 kg copper-zinc alloy contains 40% copper. How much copper will the alloy contain if 15 kg
| August 22, 2021 | education
An 85 kg copper-zinc alloy contains 40% copper. How much copper will the alloy contain if 15 kg of copper is added to it?
Find the initial weight of copper in the alloy.
To do this, multiply 85 kg by the percentage of copper.
We get:
85 * 40% / 100% = 85 * 0.4 = 34 kg.
In the event that 15 kg of copper are added to this alloy, then its total weight will be:
85 + 15 = 100 kg.
The weight of copper in the alloy will be equal to:
34 + 15 = 49 kg.
Find the percentage of copper in the new alloy.
To do this, divide 49 kg of copper by the total weight of the alloy and multiply by 100%.
The result will be:
49/100 * 100% = 4900/100 = 49%.
Answer:
The alloy will contain 49% copper.
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