Question 270456
.10x+.70y=.50(x+y)
.10x+.70y=.50x+.50y
.10x-.50x-.50y+.70y=0
.40x+.20y=0
This tells us that twice as much of the 70% solution (y) is used as the 10% solution (x).
Proof:
.10*1+.70*2=.50(1+2)
.1+1.4=.5*3
1.5=1.5