Question 1190855
{{{30(18-h)+90h=40*18}}}-----------for h liters of the 90% and 18-h of the 30%


{{{30*18-30h+90h=40*18}}}

{{{(90-30)h=40*18-30*18}}}

{{{h=(40*18-30*18)/(90-30)}}}

{{{highlight_green(h=18((40-30)/(90-30)))}}}

{{{h=18((4-3)/(9-3))}}}

{{{highlight(h=18(1/6))}}}