SOLUTION: How many gallons of a 25% acid solution must be mixed with 100 gallons of a 6% acid solution to obtain a mixture that is 20% acid?

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Question 440000: How many gallons of a 25% acid solution must be mixed with 100 gallons of a 6% acid solution to obtain a mixture that is 20% acid?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
.25x+100(.06)=.20(x+100)
.25x+6=.20x+20
.05x=14
x=14/.05=280 gallons of 25% acid solution must be added..