SOLUTION: How many liters of a 10% salt solution must be mixed with 15 liters of a 40% salt solution to obtain a 20% salt solution? I have no idea how to set this eqaution up

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Question 406731: How many liters of a 10% salt solution must be mixed with 15 liters of a 40% salt solution to obtain a 20% salt solution? I have no idea how to set this eqaution up
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

Let x represent represent the amount of 10% solution

Question states*** 

Mixing together to form (15L+x) 20% solution

 .10x + .40*15L = .20(15L+x)

Solving for x 

    .20*15L = .10x

     .20*15L/.10 = x = 30L, the amount of the 10% solution



CHECKING our Answer***

   3 + 6 = .20*45 = 9