Question

A coin contains 9 grams of nickel and 16 grams of copper, for a total weight of 25 grams. What percentage of the metal in the coin is copper?

Answer 1

To find the percentage, we take the amount of copper and divide it by the total weight. In this case, there are 16 grams of copper.

16/25 is 0.64.

The answer is 64 percent.

Answer 2

64% of the metal in the coin is copper.

Explanation:

A coin contains nickel = 9 grams

and copper = 16 grams.

Total weight of the coin = 16 + 9 = 25 grams

Now we have to calculate the percentage of copper in the coin.

Therefore,
`(16)/(25)` × 100

= 0.64 × 100

= 64%

Hence 64% of the metal in the coin is copper.