SOLUTION: how much acid 90% pure must be added to 15 0z. of 60% acid to make a mixture which is 75% pure

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Question 311512: how much acid 90% pure must be added to 15 0z. of 60% acid to make a mixture which is 75% pure
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
how much acid 90% pure must be added to 15 0z. of 60% acid to make a mixture which is 75% pure
.
Let x = amount of 90% acid added
then
.90x + .60(15) = .75(x+15)
.90x + 9 = .75x+11.25
.15x + 9 = 11.25
.15x = 2.25
x = 15 Oz.