Question 549949
Alcohol in 15% solution = {{{ .15*400 = 60 }}} ml
{{{ ( x + 60 ) / ( x + 400 ) = .32 }}}
{{{ x + 60 = .32*( x + 400 ) }}}
{{{ x + 60 = .32x + 128 }}}
{{{ .68x = 68 }}}
{{{ x = 100 }}}
x is 100 ml
check answer:
{{{ ( 100 + 60 ) / ( 100 + 400 ) = .32 }}}
{{{ 160 / 500 = .32 }}}
{{{ 8/25 = .32 }}}
{{{ 8 = 8 }}}
OK