Fill a bottle of water in the bottle, drain out (1/2) of all the water, then pour in the same amount of alcohol, pour out (1/3) of the whole solution, and fill it up with alcohol, then the alcohol at this time How much of the total solution. (expressed in fractions)
瓶内装满一瓶水，导出全部水的(1/2)，然后再灌入同样多的酒精，又倒出全部溶液的(1/3)，又用酒精灌满，那么这时的酒精占全部溶液的多少．(用分数表示)
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(1/2) * (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/2) - (1/3)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<result>5/6 = around 0.833333</result>