In an alloy that weighs 500 grams. fits 160 grams of copper. What percentage of this alloy is copper.

You need to solve problems with interest. Let’s use proportioning for this.

It is known that 500 gr. is the total mass of the alloy. We take this mass as 100%. The percentage of copper is denoted by x.

Let’s make the proportion:

500 gr. = 100%;

120 g = x%.

Solve the proportion using the diagonal method by multiplying each diagonal.

500 * x = 12000;

Find x by freeing it from the coefficient. To do this, we divide both sides of the equation by the coefficient at x (i.e., by 500).

We get:

x = 24%.

Answer: copper is 24%.