1) Let us find out what mass of copper the alloy has, if we know that the entire mass of the alloy is 10 kg, and the copper content in it is 35%.
10 – 100%;
X – 35%;
X = 10 * 35/100;
X = 3.5 kg.
2) We find out what mass of aluminum is in the alloy, if we know that the mass of the alloy is 10 kg, and we learned that 3.5 kg in it is copper.
10 – 3.5 = 6.5 kg.
Answer: The mass of aluminum in the available alloy was 6.5 kg.
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