Question 825498
Let a = amount of alcohol, volume, liters, to add


{{{Amount of Alcohol = 12+a}}}
{{{Amount of Mixture to Result = 12+30+a}}}


{{{(12+a)/(12+30+a)=0.60}}}, for 60% alcohol result.
Solve the equation for a.


The first step should be at {{{a+12=0.6(a+42)}}}