SOLUTION: how many liters pf 50% antiseptic solution must be added to 4 liters of a 20% solution in order to get a 30% antiseptic solution?

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Question 816699: how many liters pf 50% antiseptic solution must be added to 4 liters of a 20% solution in order to get a 30% antiseptic solution?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

.50x + .20*4L = .30(4+x)

      .20x = .40

         x = 2L of 50% antiseptic solution must be added 

CHECKING our answer***

 1.00 + .80 = 1.80L  Of antiseptic in final solution