Question 1157175
Liters of 40% solution = x
Liters of 80% solution = y
<pr>
x + y = 8
0.40x + 0.80y = 0.50(8)
<pr>
x + y = 8
0.40x + 0.80y = 4
<pr>
Multiply first equation by -0.80:
<pr>
-0.80 - 0.80y = -6.40
0.40x + 0.80y = 4
<pr>
Add the equations together:
<pr>
-0.40x = -2.40
<pr>
x = 6
<pr>
Since x = 6, and we know x + y = 8, that means y = 2.
<pr>
Liters of 40% solution = x = 6
Liters of 80% solution = y = 2