Question 1158867
If evaporating x pounds of water,
{{{(12*80)/(80-x)=20}}}


{{{(80-x)/(12*80)=1/20}}}


{{{80-x=(12*80)/20=12*4=48}}}


{{{80-x=48}}}


{{{x=80-48}}}


{{{highlight(x=32)}}}