(Continued from above the video). E.g. Find out how many gallons of a 15% acid solution must be mixed with 5 gal of a 20 % acid solution to make a 18% solution?
This problem can be written in the form of the equation:
         .15x + 1 =.18(5 + x)
When we simplify it, value of x = 33.3 i.e. we'll need 33.3 gallons of the 15% acid solution.

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