SOLUTION: How much pure acid should be mixed with 6 gallons if a 60% acid in order to get a 70% acid solution

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Question 428511: How much pure acid should be mixed with 6 gallons if a 60% acid in order to get a 70% acid solution
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
.......... Percent ---------------- quantity
Solution ..........60----------------30
Pure acid.........100----------------x
Total 70 ---------------- 30+x
60*6+100 *x=70(6+ x)
360+100x =420+70x
100x-70 x=420-360

30x=60
/30
x=2 gallons 100 % Pure acid