Algebra
posted by Mike .
a chemist mixed a 15% glucose solution with a 35% glucose solution. This mixture produed 35 liters of 19% glucose solution. How many liters of each solution did the chemist use in the misture?

Let x = the volume of the weak solution
Let y = the volume of the strong solution
x + y = 35 (total volume)
0.15 x + 0.35 y = (0.19)*35 = 6.65
(amount of glucose in mixture)
Solve those two simultaneous equations.