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 320 grams of a copper-silver alloy that is 20% copper by weight? (Round your answers to one decimal place.)

Answer 1

copper: what is 20 percent of 320
silver: what is 80 percent of 320

This is hardly algebra.