Question 779087
Let {{{ w }}} = ml of water to be added
The ml of alcohol never changes
{{{ ( .09*14 ) / ( 14 + w ) = .07 }}}
{{{ 1.26 = .07*( 14 + w ) }}}
{{{ 1.26 = .98 + .07w }}}
{{{ .07w = .28 }}}
{{{ x = 4 }}}
4 ml of water must be added
check:
{{{ ( .09*14 ) / ( 14 + w ) = .07 }}}
{{{ ( .09*14 ) / ( 14 + 4 ) = .07 }}}
{{{ 1.26 = .07*18 }}}
{{{ 1.26 = 1.26 }}}
OK