SOLUTION: How many gallons of a 5% alcohol solution must be mixed with 90 gallons of 1% solution to obtain a 2% solution?

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Question 718271: How many gallons of a 5% alcohol solution must be mixed with 90 gallons of 1% solution to obtain a 2% solution?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
g = unknown gallons of the 5% alcohol to add.

%285g%2B1%2A90%29%2F%28g%2B90%29=2
Solve for g.

First couple of steps:
5g%2B90=2%28g%2B90%29
5g%2B90=2g%2B180
3g=180-90
...and you can continue.