The mass of copper is 77% of the mass of bronze. How many kilograms of bronze can be made with 385 kg of copper?

It is known from the problem statement that the mass of copper is 77 percent of the mass of bronze. There is only 385 kilograms of copper. To find out how many kilograms of bronze can be made from the available supply of copper, you need to make a proportion.

385 – 100%;
x – 77%;

(385 * 100): 77 = 38500: 77 = 500 (kilogram) – this is how much you can make bronze with 385 kilograms of copper.

Answer: With 385 kilograms of copper, you can make 500 kilograms of bronze.