Question 1197162
v mL of the 95%
1040-v of the 15%


{{{95v+15(1040-v)=20*1040}}}



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{{{95v+15*1040-15v=20*1040}}}

{{{95v-15v+15*1040=20*1040}}}

{{{(95-15)v=20*1040-15*1040}}}

{{{v=(20*1040-15*1040)/(95-15)}}}

{{{highlight_green(v=1040((20-15)/(95-15)))}}} a convenient form from which to start computations.