A nurse has two solutions that contain different concentrations of a certain medication. One is a 20% concentration and the other is a 5% concentration. How many cubic centimeters of each should he mix to obtain 10 cc of a 18.5% solution?

Answer 1

.20 x + [.05 (10 - x)] = .185 * 10

multiply by 100 ... 20 x + 50 - 5x = 185

Answer 2

x=9
y=-32.3