SOLUTION: How much pure acid should be mixed with 2 gallons of aa 60% acid solution in order to get a 90% acid​ solution

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Question 1076465: How much pure acid should be mixed with 2 gallons of aa 60% acid solution in order to get a 90% acid​ solution
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
x, gallons of 100% acid to add

%28x%2B%282%29%2A%280.6%29%29%2F%28x%2B2%29=0.9