How much 9% saline solution should Kent mix with 80 cubic centimeters (cc) of a 19% saline solution to produce a 13% saline solution?

Answer 1

9X + 19(80) = 13(80+X)

9X + 1520 = 1040+13X

4X = 480

X = 120 cc of 9% to mix with 80 cc of 19% to get 200 cc of 13%

13-9 = 4

19-13 = 6

you need more of 9% since it's closer to 13% than 19% is.

4/6 = 2/3 = 80/120

9(120) + 19(80) = 13(200)

1080 + 1520 = 2600