Question 1153594
v, the volume of 35%
32-v, volume of the 3%


{{{35v+3(32-v)=4*32}}}

Solve.  Algebra steps first.  Computation later.


{{{35v+3*32-3v=4*32}}}
{{{35v-3v=4*32-3*32}}}
{{{v(35-3)=32(4-3)}}}
{{{v=32((4-3)/(35-3))}}}
{{{highlight_green(v=32(1/32)=1)}}}={{{1}}}



---------------------OR MUCH QUICKER---------------------------------------------

{{{highlight_green(35v+3*32-3v=4*32)}}}

{{{32v=4*32-3*32}}}

{{{highlight(v=32/32)}}}-------------meaning 1 fluid ounce of the 35%, and 31 fluid ounce of the 4%.