Question 209549
.5x+.25(10-x)=.4*10
.5x+2.5-.25x=4
.25x=4-2.5
.25x=1.5
x=1.5/.25
x=6 liters of the 40% solution is uses.
10-6=4 liters of the 25% solution is used.
Proof:
.5*6+.25*4=4
3+1=4
4=4