Question 1134733
{{{ .9985*1 = .9985 }}} oz of acid in the 
original mixture
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Let {{{ x }}} = the oz of water to be added
{{{ .9985 / ( 1 + x ) = .1 }}}
{{{ .9985 = .1*( 1 + x ) }}}
{{{ .9985 = .1 + .1x }}}
{{{ .1x =.8985 }}}
{{{ x = 8.985 }}} 
8.985 oz of water must be added
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check:
{{{ .9985 / ( 1 + 8.985 ) = .1 }}}
{{{ .9985 / 9.985 = .1 }}}
OK