The mass of an alloy of copper and tin is 720g. The ratio of the mass of copper to the mass of tin in the alloy is 7: 5.
| June 19, 2021 | education
The mass of an alloy of copper and tin is 720g. The ratio of the mass of copper to the mass of tin in the alloy is 7: 5. How many grams of copper, how many grams of tin is contained in the alloy?
1. Let’s find how many parts are in the alloy of copper and tin.
7 + 5 = 12 (parts).
2. Find how many grams are in one part.
720g: 12 = 60g.
3. Find the mass of copper in the alloy, if it is known that it is 7 parts.
60 x 7 = 420 g.
4. Find the mass of tin in the alloy.
60 x 5 = 300 g (or: 720 g – 420 g = 300 g).
Answer: the mass of copper is 420 g; tin weight 300 g.
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