Alloy weighing 600 grams containing 12% silver added 60 grams of silver what was the percentage of silver in one alloy?

Let’s calculate the percentage of silver, if you have added 60 g of silver and the weight of the alloy of 600 g, which contains 12% silver, is also known.

Let’s solve using the proportion method. Let’s find how many grams of silver in the alloy is 600 g.

And so 600 g is 100%.

And x is 12%.

x = 600 * 12/100 = 72 g of silver.

Added another 60 g + 72 g = 132 g total in the new alloy.

The mass of the new alloy is 600 g + 60 g = 660 g.

And to find the percentage, you need to make a proportion.

660 g – 100%.

72 g – x.

From here we find x = 72 * 100/660 = 20%

Answer: 20% silver.