Question 252459
x+.65(56-x)=56*.80
x+36.4-.65x=44.8
.35x+36.4=44.8
.35x=8.4
multiply by 100 to remove decimals
35x=840
x=24 grams of pure silver are added to 32 grams of 65% silver
check
1*24+.65(32)=56*.80