SOLUTION: how many liters of each of 5%,10%, and 40% acid solution should be mixed together to get 18L of 20% solution, if the amount of 5% solution used to be 4L more than the amount of 10%

Question 930267: how many liters of each of 5%,10%, and 40% acid solution should be mixed together to get 18L of 20% solution, if the amount of 5% solution used to be 4L more than the amount of 10% solution used
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
x, y, z for volume of 5,10,40 percents acid.

.

Acid/volume=20%

Part of the description means . Substituting into the other two equations:

;
Just simplify and solve this system for y and z, and then evaluate x.
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