Question 504539
.10x*.40(100-x)=.25*100
.10x+40-.40x=25
-.30x=25-40
-.30x=-15
x=-15/-.30
x=50 ml. of 10% iodine is used.
100-50=50 ml. of 40% iodine is used.
Proof:
.10*50+.40*50=.25*100
5+20=25
25=25