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:

The coin has 64% of copper.

Step-by-step explanation:

We are given,

Amount of Nickel contained in the metal coin = 9 grams

The Amount of copper contained in the metal coin = 16 grams

Total weight = 25 grams.

Percentage of copper present in the coin = (16/25) x 100

            = 64%

We calculated this percentage by this expression, (Amount of copper/total weight) x 100.

We can evaluate the percentage in the similar manner for any question.

Suppose that we have to calculate the percentage of x in a substance which has a maximum amount of y. Then in this case, we will apply the formula = (x/y) x 100