Jawapan

2016-06-25T09:33:09+08:00
If there is 3.75 grams copper for every 1.25 grams nickel, then we have 3.75 grams copper for every 3.75+1.25=5 grams of metal.  As a result, 3.75/5=3/4 of the coin is copper.  This is equal to 75 percent.