How many ounces of a 60% salt solution must be added to 30 ounces of a 20 percent salt solution so that the resulting mixture is 40% salt?  Choose the correct answer:
A) 16.67
B) 30
C) 50
D) 60.33
E) 70
let x=ounces of 60% salt solution to be added   .2*30+.6x=.4(30+x)   x=30   Answer 30
<result>B</result>
How many ounces of a 60% salt solution must be added to 30 ounces of a 20 percent salt solution so that the resulting mixture is 40% salt?