Question 732069
.50X+.20(12-X)=.40*12
.50X+2.4-.20X=4.8
.30X=4.8-2.4
.30X=2.4
X=2.4/.30
X=8 LITERS OF 50% SOLUTION IS USED.
12-8=4 LITERS OF 20% SOLUTION IS USED.
PROOF:
.50*8+.20*4=.40*12
4+.8=4.8
4.8=4.8