SOLUTION: A chemist mixed 30% acid and 80% acid solutions and produced 5 gallons of 50% solution. How many liters of each were combined to produce the resulting solution?

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Question 1145487: A chemist mixed 30% acid and 80% acid solutions and produced 5 gallons of 50% solution. How many liters of each were combined to produce the resulting solution?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
x of 80%
5-x of 30%

30%285-x%29%2B80x=50%2A5
-
30%2A5-30x%2B80x=50%2A5
%2880-30%29x=50%2A5-30%2A5
x=%2850%2A5-30%2A5%29%2F%2880-30%29
highlight_green%28x=5%28%2850-30%29%2F%2880-30%29%29%29
x=5%28%285-3%29%2F%288-3%29%29
highlight_green%28x=5%282%2F5%29%29

highlight%28x=2%29