The mass of the alloy of copper and silver is 7.2 kg. The mass of silver is 80% of the mass of copper.
| March 22, 2021 | education
The mass of the alloy of copper and silver is 7.2 kg. The mass of silver is 80% of the mass of copper. How many kg of copper is in the alloy.
1. Let’s calculate what is the mass of silver in the alloy if its weight is 80% of the mass of the alloy:
(7.2 / 100) * 80 = 0.072 * 80 = 5.76 kg.
2. Determine the mass of copper in the alloy, if out of 7.2 kg of the alloy, 5.76 kg is silver:
7.2 – 5.76 = 1.44 kg.
Answer: the mass of copper in the alloy is 1.44 kg.
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