The alloy which weighs 500g contains 169g of copper What percentage of the alloy does copper become?

It is known from the condition that an alloy weighing 500 grams contains 169 grams of copper. In order to find how many percent of the alloy is copper, let’s compose and solve the proportion.

Let’s take the weight of the alloy as 100%, and use the variable x to denote the percentage of copper in the alloy.

We proceed to drawing up and solving the proportion.

500 grams of alloy – 100%;

169 grams of copper – x%;

500/169 = 100 / x;

We are looking for an unknown extreme member of the proportion:

x = (169 * 100) / 500 = 16900/500 = 33.8% copper content in the alloy.

Answer: 33.8%.