Question 192321
.20x+.12(1-x)=.15*1
.20x+.12-.12x=.15
.08x=.15-.12
.08x=.03
x=.03/.08
x=.375 liters od 20% solution is used.
1-.375=.625 liters of 12% solution is also used.
Proof:
.20*.375+.12*.625=.15*1
.075+.075=.15
.15=.15