200 g of alloy contains 80 g of copper, then 300 g of copper alloy contains?

Option number 1.

Determine how many grams of alloy is per gram of copper:

200: 80 = 2.5.

Let’s determine how many grams of copper will be contained in the alloy, which has a mass equal to 300 grams:

300: 2.5 = 120.

Option number 2.

Let us determine how many times a mass of 300 grams is greater than a mass of 200 grams:

300: 200 = 1.5.

Let’s determine how many grams of copper will be contained in the alloy, which has a mass of 300 grams:

80 * 1.5 = 120.

Answer: The mass of copper is 120 grams.