Question 282711
v gallons of 90%
4-v gallons of 30%
result concentration 45%


{{{90v+30(4-v)=45*4}}}


{{{90v-30v+30*4=45*4}}}

{{{(90-30)v+30*4=45*4}}}

{{{(90-30)v=45*4-30*4}}}

{{{highlight(v=4((45-30)/(90-30)))}}}
Compute this and evaluate {{{4-v}}}.