<PRE><B>Question 809689</B>
 How many cubic centimeters of a 20% saline solution should be added to 20 cubic centimeters of a 60% saline solution to create a 30% saline solution?
:
let x = amt of 20% solution to accomplish this
:
.60(20) + .20x = .30(x+20)
12 + .20x = .30x + 6
12 - 6 = .30x - .20x
.10x = 6
x = 6/.1
x = 60 cu/cm</PRE>