Question 1076156
Let n be the amount of 35% solution. Then the amount of 90% solution would be 55-n. So:
.35n+.9(55-n)=.6(55)
49.5-0.55n=33
0.55n=16.5
n=30
You need 30L of 35% solution; and 25L of 90% solution. ☺☺☺☺