Question 797407
{{{ .15*35 = 5.25 }}} pounds of salt in solution
Let {{{ x }}} = pounds of salt to be added
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{{{ ( 5.25 + x ) / ( 35 + x ) = .25 }}}
{{{ 5.25 + x = .25*( 35 + x ) }}}
{{{ 5.25 + x = 8.75 + .25x }}}
{{{ .75x = 8.75 - 5.25 }}}
{{{ .75x = 3.5 }}}
{{{ x = 4.667 }}}
4.667 pounds of salt must be added
check:
{{{ ( 5.25 + x ) / ( 35 + x ) = .25 }}}
{{{ ( 5.25 + 4.667 ) / ( 35 + 4.667 ) = .25 }}}
{{{ 9.91667 / 39.667 = .25 }}}
{{{ 9.91667 = .25*39.667 }}}
{{{ 9.91667 = 9.91667 }}}
OK