Question 804873
Let {{{ w }}} = ounces of water to be added
{{{ .55*38 = 20.9 }}} ounces of boric acid
in 55% solution
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{{{ 20.9 / ( 38 + w ) = .38 }}}
{{{ 20.9 = .38*( 38 + w ) }}}
{{{ 20.9 = 14.44 + .38w }}}
{{{ .38w = 6.46 }}}
{{{ w = 17 }}}
17 ounces of water should be added
check:
{{{ 20.9 / ( 38 + 17 ) = .38 }}}
{{{ 20.9 / 55 = .38 }}}
{{{ 20.9 = .38*55 }}}
{{{ 20.9 = 20.9 }}}
OK