Question 1164328
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Originally, the tank was  {{{2/3}}}  full.


10% of this volume was drawn out.


It means that remaining  <U>OIL volume in the tank</U>  is  {{{2/3}}} - {{{(1/10)*(2/3)}}} = {{{20/30 - 2/30}}} = {{{18/30}}} = {{{3/5}}}  of the full tank capacity.


Hence, the tank is  now  1 - {{{3/5}}} = {{{2/5}}}  empty.    <U>ANSWER</U>
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The solution and the answer by @josgarithmetic &nbsp;BOTH &nbsp;ARE &nbsp;WRONG.