Question 221975
.33x+.05(80-x)=.12*80
.33x+4-.05x=9.6
.33x-.05x=9.6-4
.28x=5.6
x=5.6/.28
x=20 L of 33% solution is used.
80-20=60 L of 5% solution is used.
Proof:
.33*20+.05*60=.12*80
6.6+3=9.6
9.6=9.6