A u. s. Nickel contains 3.9 g of copper and 1.2 g of nickel. How many kg of copper must be combined with 500 kg of nickel to make nickel coins?

3.9 g of copper ... 1.2 g of nickel

x kg of copper ... 500 kg of nickel

If you want to know how many kg of copper must be combined with 500 kg of nickel to make nickel coins, you can calculate this using the following steps:

x * 1.2 = 500 * 3.9 / 1.2

x = 500 * 3.9 / 1.2

x = 1625 kg of copper

Result: 1625 kg of copper must be combined with 500 kg of nickel to make nickel coins.