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.)

The answer to your question is: 200 g

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

i think it’s a. this is because if they measured the mass of something with a mass of 150g, then their final answer would have to be approximately 150g. though all of their answers are almost 150, rosa and tran have the closest answers (or the exact answer) to the accurate one.

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