SOLUTION: How many gallons of a 20% ammonia solution should be mixed with 50 gallons of a 50% ammonia solution to make a 30% ammonia solution?

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Question 325726: How many gallons of a 20% ammonia solution should be mixed with 50 gallons of a 50% ammonia solution to make a 30% ammonia solution?
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
How many gallons of a 20% ammonia solution should be mixed with 50 gallons of a 50% ammonia solution to make a 30% ammonia solution?
.
Let x = gallons of 20% ammonia solution added
then
.20x + .50(50) = .30(50+x)
.20x + 25 = 15+.30x
25 = 15+.10x
10 = .10x
100 gallons = x