Question 797403
The total ounces of solution is {{{ 60 + 15 = 75 }}} oz
Let {{{ x }}} = ounces of water that evaporate
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{{{ 15 / ( 75 - x ) = .6 }}}
{{{ 15 = .6*( 75 - x ) }}}
{{{ 15 = 45 - .6x }}}
{{{ .6x = 45 - 15 }}}
{{{ .6x = 30 }}}
{{{ x= 50 }}}
50 ounces of water evaporate
check:
{{{ 15 / ( 75 - 50 ) = .6 }}}
{{{ 15 / 25 = .6 }}}
{{{ 15 = .6*25 }}}
{{{ 15 = 15 }}}
OK