Question 1054509
{{{ .15*250 = 37.5 }}} liters of salt in 15% solution
Let {{{ x }}} = liters of water to be removed by evaporation
-----------------------
{{{ 37.5 / ( 250 - x ) = .32 }}}
{{{ 37.5 = .32*( 250 - x ) }}}
{{{ 37.5 = 80 - .32x }}}
{{{ .32x = 80 - 37.5 }}}
{{{ .32x = 42.5 }}}
{{{ x = 132.8125 }}}
132.8125 liters of water must be evaporated
------------------
check:
{{{ 37.5 / ( 250 - x ) = .32 }}}
{{{ 37.5 / ( 250 - 132.8125 ) = .32 }}}
{{{ 37.5 / 117.1875 = .32 }}}
{{{ 37.5 = 37.5 }}}
OK