SOLUTION: how many liters of 20% solution and how many liters of 70% solution must be combined to produce five liters of 40% solution?

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Question 228584: how many liters of 20% solution and how many liters of 70% solution must be combined to produce five liters of 40% solution?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
.70X+.20(5-X)=.40*5
.70X+1-.20X=2
.50X=2-1
.50X=1
X=1/.5
X=2 L OF 70% SOLUTION IS USED. |
5-2=3 L OF 20% SOLUTION IS USED. | these are the 2 answers.
PROOF:
.70*2+.20*3=.40*5
1.4+.6=2
2=2