a.u.s nickel contains 3.9g of copper and 1.2g of nickel.

how many kilograms of copper must be combined with 500 kg of nickel to make nickel coins?

1,625

You also can write fraction:

3.9/1.2=x/500

1.2*x=3.9*500

1.2*x=1950 Divide with 1.2

x=1950/1.2

x=1625

1625

copper/nickel=3.9/1.2=3.25

500*3.25=1625 kg of copper

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1625

Correct!