Question 1203656
Two Thirds the way from one to the other between the two available acid stock solutions



If you WANT the amount of the 10% to be unknown variable then x.


Amount of the 40% is 30-x.


{{{10x+40(30-x)=20*30}}}

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{{{10x+40*30-40x=20*30}}}

{{{(10-40)x=20*30-40*30}}}

{{{(40-10)x=40*30-20*30}}}

{{{x=(40*30-20*30)/(40-10)}}}

{{{x=30((40-20)/(40-10))}}}

{{{highlight_green(x=30(2/3))}}}----------which is 20 gallons of the 10% acid.