Aluminum makes up 80% of the alloy, the rest is copper. Aluminum in the alloy is 300 grams more than copper.

Aluminum makes up 80% of the alloy, the rest is copper. Aluminum in the alloy is 300 grams more than copper. What is the mass of the alloy?

Let’s find the mass of copper in the alloy: 100% -80% = 20% – copper in the alloy;
Then 80% -20% = 60% – are 300 grams of aluminum;
We get:
300 – 60%
x – 100%, where x is the total mass of the alloy;
We make the proportion:
300 / x = 60/100;
300 / x = 6/10;
6x = 3000;
x = 500;
Answer: 500 grams is the mass of the entire alloy.