Pre Cal Acidic Solutions / Mixture Problem?

Derek Ocean

New member
Hi I need help on this question. I have the answer from an answer key but I have no idea how to do the math.

The question is:

One hundred gallons of a 60% acid solution are obtained by mixing a 75% solution with a 50% solution. How many gallons of each must be used to obtain the desired mixture?



... The answer is:
40 gal of 75% solution, 60 gal of 50% solution.

Please tell me how to do the work and arrive at this conclusion. Thanks!
 
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