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

Answer:

64% of the metal in the coin is copper.

Step-by-step 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, $\frac{16}{25}$ × 100

                = 0.64 × 100

                = 64%

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

Answer 2

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.