Question 730666
{{{ .8*20 = 16 }}} pounds of alcohol originally in solution
Let {{{ x }}} = pounds of alcohol to be added
{{{ ( x + 16 ) / ( x + 20 ) = .85 }}}
{{{ x + 16 = 85*( x + 20 )
{{{ x + 16 = .85x + 17 }}}
{{{ .15x = 1 }}}
{{{ x = 6.667 }}}
6.66 pounds of alcohol need to be added