Question 1098794
"Ounces", one would assume  percents are as weight per weight.



Available are 18% and 9% acid solutions.
Let x be how much 18% acid.
36-x is how much 9% acid to use.


{{{(18x+9(36-x))/36=15}}}


{{{18x+9(36-x)=15*36}}}

{{{18x+9*36-9x=15*36}}}

{{{9x=15*36-9*36}}}

{{{9x=6*36}}}

{{{x=6*4}}}

{{{highlight(x=24)}}}--------"ounces" of the 18% acid.
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{{{highlight(12)}}}---------ounces of the 9% acid.




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"Hydroelectric Acid" ------ must be for fiction