Question 339646
.70X+.20*60=.30(60+X)
.70X+12=18-.30X
.70X-.30X=18-12
.40X=6
X=6/.4
X=15 OZ. OF 70% SILVER IS USED.
PROOF:
.70*15+.20*60=.30(60+15)
10.5+12=.30*75
22.5=22.5