Question 825944
{{{ .25*500 = 125 }}} cc of antibiotic in 25% solution
Let {{{ w }}} = cc of water to be added
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{{{ 125 / ( 500 + w ) = .16 }}}
{{{ 125 = .16*( 500 + w ) }}}
{{{ 125 = 80 + .16w }}}
{{{ .16w = 125 - 80 }}}
{{{ .16w = 45 }}}
{{{ w = 45/.16 }}}
{{{ w = 281.25 }}}
281.25 cc of water must be added
check:
{{{ 125 / ( 500 + w ) = .16 }}}
{{{ 125 / ( 500 + 281.25 ) = .16 }}}
{{{ 125 / 781.25 = .16 }}}
{{{ 125 = .16*781.25 }}}
{{{ 125 = 125 }}}
OIK