Question 1044949
x=amount of 50% saline solution
0.50x=(9+x)(0.20); that is added to the 9 ml
0.50x=1.8+0.2x
0.3x=1.8
x=6 ml of 50%, ANSWER
6 ml of 0.5 saline is 3 ml pure saline
15 ml of 0.2 saline is 3 ml pure saline