The alloy includes copper, tin and antimony in a ratio of 3: 11: 6. Find the percentage of copper
The alloy includes copper, tin and antimony in a ratio of 3: 11: 6. Find the percentage of copper, tin and antimony in this alloy. What is the mass of an alloy if it contains 4 kg more tin than copper?
Let’s find how many parts the alloy contains:
1) 3 + 11 + 6 = 20 (h.)
The mass of the entire alloy is 100%, we find how many percent are for each part:
2) 100/20 = 5 (%).
Then if copper is 3 parts:
3) 5 * 3 = 15 (%) – the percentage of copper.
If tin is 11 parts:
4) 5 * 11 = 55 (%) – tin.
Antimony 6 parts, which means:
5) 5 * 6 = 30 (%) – antimony.
Let’s find how many parts of tin are more than copper:
6) 11 – 3 = 8 (parts).
Because 4 kg = 4000 g, then 8 parts have a difference of 4000 g and one part:
7) 4000/8 = 500 (g).
Since there are only 20 parts in the alloy, the mass will be equal to:
8) 500 * 20 = 10000 (g)
Or 10,000 g = 10 kg.
Answer: in an alloy of copper 15%, tin 55%, antimony 30%, the mass of the alloy is 10 kg.