Question 130138
.13X+.03(90-X)=.08*90
.13X+2.7-.03X=7.2
.10X=7.2-2.7
.10X=4.5
X=4.5/.1
X=45 ML OF 13% SOLUTION IS USED.
90-45=45 ML OF 3% IS ALSO USED.
PROOF
.13*45+.03*45=.08*90
5.85+1.35=7.2
7.2=7.2