Fill the container with 10 liters of alcohol with a concentration of 81%. After pouring out several liters for the first time, fill it up with water and mix thoroughly. After pouring out the same number of liters for the second time, fill it up with water and mix thoroughly. The pure alcohol in the container is 3.6 liters, how many liters are poured each time?
容器中装满浓度为81%的酒精10升，第一次倒出若干升后，用水加满，调匀，第二次再倒出同样的升数后，再用水加满，调匀，这时，容器内的纯酒精为3.6升，问每次倒出多少升？
<gadget id="calculator">10 / 3</gadget>
<output>10/3 = around 3.333333</output>

<result>10/3 = around 3.333333</result>