Question 1005187
x liters of 20%
.20x+30(.50)=(x+30)(.40)
.20x+15=.40x + 12
-.20x= -3
x=15 liters
15*(.20 pure acid)=3 liters
30*(.50 pure acid)=15 liters
That is 18 liters pure acid
That is 45 liters solution *0.45 pure acid=18 liters.
The answer is 15 liters