Question 511311
Let {{{w}}} = ml of water to be added
given:
{{{ .25*250 = 62.5 }}} ml of salt in 25% solution
{{{ 62.5 / ( 250 + x ) = .1 }}}
{{{ 62.5 = .1*( 250 + x ) }}}
{{{ 62.5  = 25 + .1x }}}
{{{ .1x = 62.5 - 25 }}}
{{{ .1x = 37.5 }}}
{{{ x = 375 }}}
375 ml of water must be added