SOLUTION: How many liters of a 20% salt solution must be added to 42 L of a 38% salt solution to get a 28% salt solution?

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Question 172267: How many liters of a 20% salt solution must be added to 42 L of a 38% salt solution to get a 28% salt solution?
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
let x be the amount of 20% solution
:
.2x+.38(42)=.28(x+42)
:
.2x+15.96=.28x+11.76
:
.08x=4.2
:
highlight%28x=52.5%29liters of 20% solution