The weight of the copper and silver alloy is 7.2 kg. The mass of silver is 80% of the mass of copper.
| December 18, 2020 | education
The weight of the copper and silver alloy is 7.2 kg. The mass of silver is 80% of the mass of copper. How many kg of copper is in the alloy?
Let x be the mass of copper
Then 0.8x the mass of silver
It is known that the mass of an alloy of copper and silver is 7.2 kg
x + 0.8x = 7.2
1.8x = 7.2
x = 7.2: 1.8
x = 4 (kg) -copper alloy
Answer: 4 kg
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