Question 432973
{{{80/(1+15e^(-.06x)) = 50}}}

<==> {{{8/5 = 1 + 15e^(-.06x)}}}
<==> {{{3/5 = 15e^(-.06x)}}}
<==> {{{1/25 = e^(-.06x)}}}
<==> {{{-2ln5 = -0.06x}}}
<==> {{{x = (2ln5)/0.06}}}
x = 53.65, to 2 decimal places.