Question

British sterling silver is a copper-silver alloy that is 7.5% copper by weight. How many grams of pure copper and how many grams of British sterling silver should be used to prepare 250 grams of a copper-silver alloy that is 20% copper by weight? (Round your answers to one decimal place.)

Answer 1

The answer to your question is: 200 g

Step-by-step explanation:

Need 250 gr of copper.silver alloy 20% copper by weight

250 g alloy -------------------- 100%

x --------------------- 20%

x = 20(250)100

x = 5000 / 100

x = 50 g of copper

Then

g of British sterling silver = 250 g alloy - 50 g of copper

g of British sterling silver = 200 g