Question 547835
Let {{{w}}} = ounces of pure water needed
given:
{{{ .15*50 = 7.5 }}} = ounces of salt in 15% solution
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{{{ 7.5 / ( 50 + w ) = .1 }}}
{{{ 7.5 = .1*( 50 + w ) }}}
{{{ 7.5 = 5 + .1w }}}
{{{ .1w = 2.5 }}}
{{{ w = 25 }}}
25 ounces of pure water are needed