SOLUTION: How much pure acid should be mixed with 2 gallons of a 30% acid solution in order to get 90% acid solution? round to two decimal places.

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Question 327380: How much pure acid should be mixed with 2 gallons of a 30% acid solution in order to get 90% acid solution? round to two decimal places.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let X be the amount of 100% acid.
100X%2B30%282%29=90%28X%2B2%29
100X%2B60=90X%2B180
10X=120
highlight%28X=12%29
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.
.
Add 12 gallons of pure acid.