SOLUTION: How many ml of 20 percent acid should be added to pure acid to make 40 ml of 35 percent acid?

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Question 764847: How many ml of 20 percent acid should be added to pure acid to make 40 ml of 35 percent acid?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
How many ml of 20 percent acid should be added to pure acid
to make 40 ml of 35 percent acid?
:
let x = amt of 20% mixture
then
(40-x) = amt of pure acid
:
.20x + (40-x) = .35(40)
.20x + 40 - x = 14
-.8x = 14 - 40
-.8x = -26
x = %28-26%29%2F%28-.8%29
x = +32.5 ml of 20% stuff