SOLUTION: How much pure acid must be mixed with 800 liters of 20% acid to get 70% acid? I got 1333.33 (repeating) Can you show me your steps? Thanks!

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Question 489641: How much pure acid must be mixed with 800 liters of 20% acid to get 70% acid?
I got 1333.33 (repeating)
Can you show me your steps?
Thanks!
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
How much pure acid must be mixed with 800 liters of 20% acid to get 70% acid?
Let x = amount (liters) of pure acid
then
x + .20(800) = .70(800+x)
x + 160 = 560+.70x
.30x + 160 = 560
.30x = 400
x = 1333.33 liters