A coin contains 999 grams of nickel and 161616 grams of copper, for a total weight of 252525 grams. What percentage of the metal in the coin is copper?

Answer 1

The percentage of Cooper in the coin is 64%

How do you come to this conclusion?

252525--100%

161616--X%

Now you can use the cross rule: X=(161616x100)/252525

Check it out now X=64%