Question 736164
.70X+.30(12-X)=.40*12
.70X+3.6-.30X=4.8
.40X=4.8-3.6
.40X=1.2
X=1.2/.40
X=3 LITERS OF 70% SOLUTION IS USED.
12-3=9 LITERS OF 30% SOLUTION IS USED.
PROOF:
.70*3+.30*9=.40*12
2.1+2.7=4.8
4.8=4.8