Question 162791
.40X+.15(150-X)=.20*150
.40X+22.5-.15X=30
.25X=30-22.5
.25X=7.5
X=7.5/.25
X=30 ML OF 40% SOLUTION IS USED.
150-30=120 ML OF 15% SOLUTION IS USED.
PROOF:
.40*30+.15*120=.20*150
12+18=30
30=30