Question 1018556
x=10%, y=30%, z=50%
x+y+z=100
.10x+.30y+.50z=20, which is 100*0.20 or the amount of "pure acid".
But we know that z=2y
Therefore x+3y=100
and .10x +.30y+.50(2y)=20
multiply second by 10
x+3y+10y=200
x=100-3y
substitute back
100-3y+3y+10y=200
10y=100
y=10 liters
z=20 liters
x=70 liters
10%*70 liters is 7 liters of pure acid
30% of 10 liters is 3 liters
50% of 20 liters is 10 liters
They add to 20 liters
10%:70 liters
30%: 10 liters
50%: 20 liters