Question 703111
Let {{{ w }}} = ml of water to be added
{{{ .15*60 = 9 }}} ml of iodine in 15% solution
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{{{ 9 / ( w + 60 ) = .1 }}}
{{{ 9 = .1*( w + 60 ) }}}
{{{ 9 = .1w + 6 }}}
{{{ .1w = 3 }}}
{{{ w = 30 }}}
30 ml of water must be added