There are two bottles, A and B. There is 400ml of pure alcohol in bottle A, and 400ml of water in bottle B. For the first time, pour 40ml of pure alcohol from A into B, and pour out 40ml of pure alcohol from B for the second time. The liquid is given to A, how many milliliters of water is in the bottle of A at this time?
有A、B两个瓶，A瓶中有400毫升纯酒精，B瓶中有400毫升清水，第一次把40毫升纯酒精由A倒入B，第二次从B中倒出40毫升混合液给A，此时A瓶中含水多少毫升？
<gadget id="calculator">400 + 40</gadget>
<output>440</output>

<gadget id="calculator">400 / 440</gadget>
<output>10/11 = around 0.909091</output>

<gadget id="calculator">40 * (10/11)</gadget>
<output>400/11 = around 36.363636</output>

<result>400/11 = around 36.363636</result>